I am going to let you into a little secret. Please don't tell anyone but I left school at 15. Yes and with not one qualification to show for it. Played up the whole time.
I went to Oxford ATS mid seventies to convert a foreign CPL to a UK ATPL. The first week at the school was maths revision. For me it was learning!! They got me through so they can get anyone through.
God bless the OATS.
Another thing I would like to mention is this. 1st day the principal interviewed the class and told us that we needed to put in a minimum of 40 hours per week home study. If you got behind in the work, you were history as far as passing any examinations were concerned. Best £100 I ever spent towards aviation training.