Really cool, I was also using an exploit with my GCSE Hegarty maths homework and doddle science, I think the 1st "exploit" was pre-GCSE the answers were stored on the client side and I just inspected the code, this got patched after, the next exploit was during my GCSE's, the answers were stored on the server so I made a github repo that used a browser extension which would let you inject JS, I think it was some kind of brute force attack with their SQL DB.
Anyway I received my GCSE results in August, I was surprised how well I did considering I did no revision, but I should've actually used hegarty maths instead of exploiting it :D
Anyway I received my GCSE results in August, I was surprised how well I did considering I did no revision, but I should've actually used hegarty maths instead of exploiting it :D