International A Level Biology, Maths & Further Maths Tutoring
Get Me That Grade provides specialist one-to-one International A Level tuition for ambitious students aiming for A and A* grades, with Biology taught by Principal Examiner and former Head of Biology Katrina Yerbury, and Maths and Further Maths taught by current Pearson Edexcel examiner and former Head of Mathematics Harry Williams.
Personalised 1:1 online tuition for Pearson Edexcel International A Level students
Fully qualified teachers with extensive experience teaching UK and international students, combining expert subject teaching with first-hand knowledge of assessment, marking, and exam technique.
Tuition is also available for selected UK A Level, IGCSE and GCSE qualifications, alongside specialist preparation for TMUA, ESAT Mathematics, and STEP.
Biology with Katrina Yerbury
Pearson Edexcel IAL Biology
Katrina is a Principal Examiner for Pearson Edexcel GCE and International A Level Biology, a fully qualified teacher with Qualified Teacher Status (QTS), and has more than 25 years’ teaching experience. A former Head of Biology at Harrow School Online, she has also held a senior examining role with OCR and examines for Cambridge International.
Her tuition combines deep subject knowledge with first-hand understanding of assessment, helping students strengthen their biological understanding, written responses, and exam technique.
Katrina offers specialist tuition in Pearson Edexcel International A Level Biology, alongside UK A Level Biology, IGCSE, and GCSE Biology.
2024 IAL Biology: 100% A*–A
“I owe my top mark to Ms. Yerbury.”
Mathematics with Harry Williams
Pearson Edexcel IAL Mathematics & Further Mathematics
Harry is a current Pearson Edexcel examiner for International A Level Mathematics and Further Mathematics, a fully qualified Maths teacher with Qualified Teacher Status (QTS), and a former Head of Mathematics at Harrow School Online.
He has more than ten years’ teaching experience and specialises in helping students develop deeper mathematical understanding, stronger exam technique, and the confidence required for the highest grades.
Harry offers specialist tuition in Pearson Edexcel IAL Maths and IAL Further Maths, alongside UK A Level Maths, A Level Further Maths, IGCSE and GCSE Mathematics and Additional Maths, and university admissions tests including TMUA, ESAT Mathematics, and STEP.
2024 IAL Maths: 35% A*, 60% A*–A, 80% A*–B
2024 IAL Further Maths: 43% A*, 86% A*–A, 100% A*–B
“I wanted to develop deep mathematical knowledge and ensure the achievement of the highest grades. I found his explanations, guidance, and way of teaching things very useful; I have never grasped mathematical concepts so fast. Harry deepened my love with maths and took me from just a beginner to getting full UMS in P1 before the mid term break! I would particularly recommend his tuition to students who want the best grades and need to improve their understanding of Mathematics quickly.”
Testimonials and Google Reviews
“I wanted to improve the way I approached ESAT problems. Harry gave incredibly clear explanations and really helpful advice for dealing with the challenging time pressure of the test. Working with him changed the way I approach difficult problems and helped me spot the most time-efficient way of solving them. Harry’s help is 100% worth it. Even after my first session, I could already see ESAT questions differently and felt much more confident.”
“I did my Maths GCSE early in November and got a U. Harry became my tutor and I resat Maths. In the summer, I received my GCSE results and got a grade B.
The most useful thing about Harry’s tuition was everything! The biggest change for me was my understanding.
If another student was considering tuition, I’d say: have Harry as a tutor.”
“Harry’s individual approach to each student was particularly valuable. He identified the key weaknesses and areas for improvement, helping to develop a deeper understanding of individual topics and improve the way problems were worked through.
I also really appreciated his teaching style, the way he interacted with the student, and the passion he brought to the lessons. I would highly recommend Harry.”
Get Me That Grade was founded by Harry Williams and Katrina Yerbury, two experienced teachers, examiners, and former Heads of Department who previously worked together at Harrow School Online.
Between them, Harry and Katrina bring decades of classroom, leadership, and examining experience. Their particular specialism is Pearson Edexcel International A Level Mathematics, Further Mathematics, and Biology, although they also support students with UK A Level Biology, Maths and Further Maths, IGCSE, and GCSE Biology, Maths and Additional Maths qualifications, alongside specialist preparation for TMUA, ESAT Mathematics, and STEP.
All tuition is live, online, and one-to-one. Students work directly with Harry or Katrina rather than being allocated to another tutor, allowing lessons to be tailored closely to their individual strengths, gaps, goals, and examination timetable.
Get Me That Grade works with students in the UK and internationally, including families across Europe, the Middle East, and South-East Asia. Lessons combine clear subject teaching, guided practice, examination technique, and detailed feedback, with the aim of developing both stronger understanding and better performance under exam conditions.
About Us: Specialist International A Level tuition
How it works
Live online tuition: One-to-one lessons with Harry or Katrina.
55-minute sessions: Usually one to three lessons per week.
International scheduling: UK-based, with availability for Europe, the Middle East, and South-East Asia.
Personalised teaching: Clear explanations, worked examples, guided practice, and explicit exam-technique coaching.
With our exceptional subject knowledge and experience teaching very highly attaining students, we can provide the stretch and challenge that the brightest students might be lacking in a normal classroom setting.
No matter the academic level of the student, we aim to get the best out of every student. We are experienced with home-educated students and emotionally based school avoidance, and teach in a calm, structured manner.
We specialise in teaching Pearson Edexcel International A-levels, and both tutors are DBS checked and on the DBS Update Service.