Online Maths Tutor | GCSE, A-Level, IB & University
Specialist Online Tuition · GCSE to University

Online Maths
Tutor

Personalised online Maths tuition that builds secure understanding, mathematical confidence and strong examination technique — taught by Dr Stathis Stefanidis, experienced educator, physicist and published author.

100% online  ·  GCSE, iGCSE, A-Level, IB & University  ·  Worldwide
Dr Stathis Stefanidis, specialist online Maths tutor
Dr Stathis Stefanidis
PhD · UCL & CERN · Published Author · 30+ Years Experience
30+
Years of teaching
experience
PhD
High-energy Physics
from UCL
CERN
ATLAS Collaboration
research experience
Worldwide
Live online tuition
across time zones
Specialist Maths Tuition

Mathematics becomes manageable
when the ideas begin to connect

Mathematics is not simply a collection of procedures to memorise. It is a connected system of ideas: number, algebra, geometry, functions, probability, statistics and calculus all build upon one another.

Many students can follow a worked example but feel uncertain when the wording changes or when several topics appear in the same problem. They may know an individual technique without understanding why it works, when to use it, or how to recognise the underlying structure of a question.

My online Maths tuition addresses that problem directly. Lessons develop secure foundations, accurate mathematical communication and flexible problem solving. Students learn to interpret questions, choose an efficient method, organise their working and check whether an answer is reasonable.

I support students who are finding Mathematics difficult, as well as high-achieving students preparing for top grades, competitive university courses, entrance examinations and Olympiads. Each programme is adapted to the student’s curriculum, present level and longer-term goals.

“Mathematical confidence grows when a student can explain not only what to do, but why the method works.”

A Rigorous, Personal Approach

How I teach Mathematics online

Every lesson has a clear purpose. I identify what the student understands, locate the point at which their reasoning becomes uncertain and then rebuild the topic through explanation, questioning and carefully selected problems.

01 · Understand
Understanding before routine
Methods are connected to the ideas behind them. Students learn why a technique works, when it applies and how it relates to earlier knowledge.
02 · Apply
Guided problem solving
I model the reasoning behind a solution, then gradually transfer responsibility to the student through questioning, prompts and increasingly independent practice.
03 · Communicate
Clear mathematical working
Students learn to present logical steps, use notation accurately, justify conclusions and communicate methods clearly enough to earn every available mark.
04 · Examine
Exam-board technique
Past-paper questions are used strategically to identify recurring structures, command words, mark-scheme expectations and the mistakes that repeatedly cost marks.
05 · Reflect
Self-correction
Students are encouraged to diagnose their own errors and explain how their method should change. This develops independence rather than reliance on the tutor.
06 · Progress
A structured path forward
Lessons respond to immediate needs while remaining part of a coherent programme, with topics revisited and combined as the student’s understanding develops.
Who I Teach

Maths tuition from GCSE
to university level

The level and pace change, but the principle remains the same: secure the foundations, understand the Mathematics and practise applying it with increasing independence.

GCSE & iGCSE
Strong foundations and confident exam technique
Support with number, algebra, ratio, geometry, probability, statistics, graphs and multi-step problem solving across the major UK and international examination boards.
Explore GCSE Maths tuition →
A-Level
Fluency, reasoning and top-grade preparation
Rigorous tuition for Pure Mathematics, Mechanics and Statistics, with sustained preparation for demanding examinations and mathematically intensive university courses.
Explore A-Level Maths tuition →
IB Diploma
Conceptual clarity for AA and AI
Specialist support for IB Mathematics: Analysis and Approaches or Applications and Interpretation at Standard and Higher Level.
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American Curriculum
Advanced high-school Mathematics
Personalised support for students following American and international programmes, including Algebra, Precalculus, Calculus and Statistics.
View all tuition services →
University & Graduate
Advanced support beyond school Maths
Individual tuition for undergraduate and graduate students who need support with mathematical methods, problem sheets, modelling, statistics or quantitative modules.
Explore university Maths tuition →
Admissions & Olympiads
Preparation beyond the standard curriculum
Challenging preparation for Mathematics Olympiads, STEP-style problems, competitive entrance assessments and university interviews.
Explore entrance exam preparation →
Mathematics Topics

From essential foundations
to advanced mathematical thinking

Programmes are aligned with the student’s specification, but lessons also reveal the connections between topics so that Mathematics is understood as a coherent subject rather than a sequence of unrelated techniques.

N
Number
Fractions, percentages, ratio, indices, surds and numerical reasoning.
x
Algebra
Expressions, equations, inequalities, sequences and algebraic proof.
f
Functions & Graphs
Transformations, modelling, inverse functions and graphical interpretation.
Geometry
Angles, similarity, circles, vectors, coordinate geometry and proof.
sin
Trigonometry
Triangles, identities, equations, radians and applications.
Σ
Sequences & Series
Arithmetic, geometric and recursive structures, including proof and applications.
d/dx
Calculus
Differentiation, integration, rates of change and mathematical modelling.
P
Probability
Conditional probability, distributions and structured counting.
Statistics
Data representation, hypothesis testing, correlation and interpretation.
v
Mechanics
Kinematics, forces, moments and mathematical models of motion.
The Online Learning Process

Focused, interactive lessons
with no travel required

Online tuition allows us to work directly on equations, graphs, diagrams and mathematical reasoning in real time. The technology supports the teaching; it does not replace thoughtful explanation or individual attention.

01
Initial discussion
We discuss the student’s curriculum, current performance, areas of concern and academic goals.
02
Targeted planning
I identify priorities and build a programme around conceptual gaps, current schoolwork and upcoming assessments.
03
Live tuition
Lessons combine explanation, questioning, worked examples and independent problem solving on a shared digital workspace.
04
Review and progress
Errors and misconceptions inform the next stage of teaching so that progress remains deliberate and cumulative.
Why Choose Phi Tuition

Mathematics taught with the clarity
the subject deserves

I have taught Mathematics and Physics for more than three decades and worked as a researcher within the CERN ATLAS Collaboration. This combination of classroom experience, mathematical expertise and advanced scientific training allows me to explain difficult ideas accurately while remaining attentive to how individual students learn.

My role is not to complete questions on behalf of the student. It is to help the student develop the understanding, habits and confidence required to solve them independently. That includes learning how to identify the structure of a problem, choose an efficient method, check an answer and communicate a conclusion clearly.

For ambitious students, lessons extend beyond routine examination questions into unfamiliar and multi-stage problems. For students who have lost confidence, we slow down, repair the foundations and create a sequence of achievable steps. In both cases, the teaching remains rigorous and respectful.

Advanced subject expertise
PhD in high-energy Physics from UCL, CERN research experience and a long record of teaching Mathematics and Physics at school and university level.
Teaching tailored to the individual
The programme responds to the student’s specification, present understanding, learning habits and academic ambitions.
Preparation for meaningful progress
Lessons develop fluency, reasoning, problem-solving discipline and exam performance together.
Available internationally
Live online teaching for students in the UK, Europe, the Gulf, Asia, Australia, New Zealand and other locations worldwide.
Curricula & Examination Boards

Tuition aligned with the course
the student is actually studying

The terminology, assessment objectives, permitted technology and topic sequence vary between specifications. Teaching is therefore aligned carefully with the student’s own course rather than relying on a generic set of lessons.

UK
AQA
GCSE and A-Level Mathematics, including Further Mathematics where appropriate.
UK
Pearson Edexcel
GCSE, International GCSE, A-Level Mathematics and Further Mathematics.
UK
OCR
GCSE and A-Level Mathematics across OCR specifications.
UK
Eduqas / WJEC
Specification-focused tuition and examination practice.
International
Cambridge
Cambridge International GCSE and advanced Mathematics programmes.
International
IB Diploma
Mathematics AA and AI at Standard and Higher Level.
United States
Advanced Maths
Algebra, Precalculus, Calculus and Statistics support.
University
Degree Modules
Individual support matched to mathematical or quantitative module content.
Frequently Asked Questions

Online Maths tuition:
what parents and students ask

Which Maths levels do you teach?
I teach GCSE and iGCSE Mathematics, A-Level Mathematics and Further Mathematics, IB Mathematics AA and AI at SL and HL, advanced high-school programmes, university modules, entrance examinations and Olympiad preparation. The suitability of tuition depends on the student’s precise course and needs, which we can discuss during an initial consultation.
How do online Maths lessons work?
Lessons take place live online using video, a shared digital whiteboard and relevant questions or resources. We can work through equations, graphs, diagrams and written solutions together in real time. The format is interactive: the student is expected to reason, write and explain rather than simply watch.
Do you teach students outside the United Kingdom?
Yes. Phi Tuition is UK-based and teaches students internationally, including families in Europe, the Gulf, Hong Kong, Singapore, Australia and New Zealand. Lesson times are agreed with the student’s time zone in mind.
Can you help a student who has lost confidence in Maths?
Yes. Loss of confidence often follows unresolved gaps in understanding rather than lack of ability. I identify the point at which the subject became uncertain, rebuild the foundations and introduce more demanding questions gradually as the student’s control improves.
Do you also teach high-achieving students?
Yes. I work with students aiming for the highest grades, selective university courses, entrance assessments, interviews and Mathematics Olympiads. Lessons can move beyond routine syllabus questions into unfamiliar problems that require deeper reasoning.
Which examination boards do you cover?
I support the major UK and international specifications, including AQA, Pearson Edexcel, OCR, Eduqas/WJEC, Cambridge International and the IB Diploma. I also work with students following American programmes, including Algebra, Precalculus, Calculus and Statistics.
Can lessons focus on examination technique?
Yes, but examination technique is most effective when built on sound understanding. We analyse command words, mark allocations, method marks, calculator use, written reasoning and common errors while ensuring that the student understands the Mathematics.
Can you help with gaps in foundational Maths?
Yes. Lessons can address arithmetic, fractions, algebra, proportional reasoning, graphs, trigonometry and other prerequisite skills required by the student’s course. These foundations are then connected carefully to the current topic.
Do you offer private and small-group tuition?
Private tuition is available for students who need a fully individual programme. Small-group options may also be available for suitably matched students. Current fees and formats are explained in the Phi Tuition Fees Guide.
How do we begin?
Book an initial consultation so that we can discuss the student’s curriculum, present level, specific difficulties and objectives. I will then advise whether I can help and what form of tuition would be most appropriate.
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Tailored course plan designed around your needs
Private 1-to-1 or small group options available
Flexible scheduling across all time zones
Competitive fees — view fees page →

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