how much is enough

i just missed crossing the line last year …this year, with the CFA books, feel better, more confident. BUT… there are simple too many fine details which can potentially be tested… I have been scoring between 65-75% in the schweser book 6, which btw is all i have bot. would you guys say the question bank or the book 7 are 'must do’s?

I would say that Q-bank is a must. Considering the amount and value of the time that you have put into studying, why put yourself at a disadvantage by limiting your prep materials?