Maybe go for an aptitude test at one of the bigger FTO's to get them to assess your academic/aptitude potential? Your english or maths might be better or worse than you think - so go and check.
I would
never recommend anyone to rely on an ATO's aptitude test.
They are self servicing marketing tools more than anything else.
The only one you should rely on is GAPANs as they are the only impartial source : -
Aptitude Tests - GAPAN