How to study for Chem and Math Lvl 2 the night before? Just take 1 test instead? Help!!

So I have been practicing math subjects tests pretty religiously for awhile from Dec 19th until Jan 13th or so. Thats when I started to get busy with finals, and SAT II’s just totally fell off my radar. I took AP Chem and the Chem subject test last year and got 670. Right now, I know less chem than I did when I took the test last year, but I feel like if I were to review tonight then I might be okay. Not sure about math, since I haven’t practiced in a week. But in that time that I practiced my score went from 630 to 760. My chemistry was only scored once and I got 600, below my original score.

So my question is, would it be worth studying for both chem and math tonight, or just drop chem and focus on Math lvl II because I haven’t taken that test yet? my math lvl I was 690 and I’d rather have a math lvl II score.

Also, I’m a senior so this is my last shot.

What would you do in this situation? And does anyone have good tips for studying the night before?