I did 'A' levels 12 years ago and only just managed to pass them.
Getting back to serious study years later was difficult but I have just recently managed to get good passes in all of the Phase I exams with OATS.
If I where you, I would do the exams now whilst your brain is still like a sponge instead of a sieve.
You can do your 'A' levels whilst queueing up to get an instructors job with me.
Mike.
PS You said "I have little patients". If this is the case, why do 'A' levels when you already have a degree in Dwarf Medicine