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Gadi Moses has said he resorted to pacing his cell and solving mental maths problems to deal with this "psychological abuse".

Lilly said she would like to be a judge or a maths teacher when she is older and is concentrating on her schoolwork and sport to help her recovery.

However, those whose families can afford private tuition may still have access to subjects including maths, science and languages.

"Things you didn't understand kept piling on top of each other. It affected all the core subjects of science, English and maths. It made me really anxious."

Students my age were far ahead in subjects like maths and science.