Need suggestions for SAT subject tests PCM

I got 600ish in Physics, chem and maths 2 tests no prep. Can I get 800 by reading thru Princeton reviews and doing practice papers from it and Barrons. (ps. don’t teme u don’t need 3 800s…the place I wana study in does) Also anything else to do? Rn I have barrons and Princeton. Any tips would be helpful…

@Chiragqatar It all depends on how much you currently know and how much you’re willing to prep.

When you got ur 600ish scores, did you already take classes in those subjects? Introductory or AP classes? If you buy Barrons or PR and read through the entire book, taking the time to understand everything, you will get an 800.

I’m not American. It’s pretty different for our skol and some topics aren’t covered. So can I get 800 using PR even for topics completely unfamiliar to me?