1. Are u memorizing the answers to the Questions?? If yes u will forget them becos it is the same as memorizing a book which we forget in weeks time. read the explanations to the answers even if u got them wrong and understand them.
2. even if u score 270....u will notice that months after the test we forget some of the things we had learnt. It is human nature.
Since u have read kaplan and FA already start doing random Timed Questions and read explanations so that getting to your exams u have everything fresh in mind

Good luck
And wuteva be the case tell us what worked for u