Ehhh overstudy?!! If you get high markes that means you understand the subject well, it is satisfactory for myself, it looks good on my CV and the most important thing of all, I want to know the subjects by heart when I fly because aviation is about safety,safety and safety. Itīs not secondary school where you can do fine with 75%
And you allso need 80% minimum to be able to contine your training with OAA.