Beginning level2 with weak level1 areas

@jasdev advice is spot on. The only place I would suggest reviewing L1 material would help would be FRA ratios as there is an expectation you know this already but only as an ancillary to where they’re discussed in the L2 syllabus. Just get studying L2 curriculum, it’s a lot of work and you need to understand those forumlae!

The Level II curriculum is quite comprehensive, so you might just be okay without reviewing topics you missed out earlier.
That said, I didn’t study LI derivatives but LII derivatives would probably have been an absolute bastard no matter what.
Give yourself more time than you think you need, for LII, and if you do get stuck in quicksand, flick back to LI and see if that material sheds any light.