Is 3 days of hardcore studying enough for a 5 on AP Calc BC?

I used to know everything, which was like 3 months ago. Forgot some stuff about partial fractions and also some applications of integration, can't do any applications of derivatives now DDD:

Also, are 2 days of study enough for Khan Units 9-10? (Polar functions, vectors, Taylor & Maclaurin series)
I really need this 5. I might get beaten if I don't. I'm currently studying for AP Stats.