You definitely should not be taking AP Physics 1 while in Algebra 2. Precalc is the minimum math you need to get by in that class so luckily you are taking that. Physics 1 is one of the hardest AP courses (in fact it has one of the lowest 5 rates). It is typically a junior year course and knowing calculus helps a lot (but isn’t required) so it would have been nice if you waited until junior year to take it alongside calc.
But that is in the past, it doesn’t make sense to withdraw this late in the year (unless you can drop to honors WITHOUT it showing up on your transcript). As for what you can do now is to do a lot of practice problems, see if you are making recurring mistakes or if there is a concept that you do not understand. Then go to the teacher to help explain that specific concept/recurring mistake. I know you are given an equation sheet but in order to succeed on the AP exam, you should have done more than enough practice to have most of them memorized to use on the spot, flipping back and forth takes up precious time on this fast-paced test.
Here is a tip: pull up some old AP practice problems and try to figure out what unit/concept they use but DON’T write any math or attempt to solve at all. Since you say you “can’t seem to know how to calculate anything,” this will help you in at least figuring out which set of equations will be usable and they are probably all proofs/derivations of each other anyway. Once you can figure out which concept to use, the math will flow naturally but you need to understand what is going on and what the problem is looking for before you can jump into computing a value. Also, doing this might help for the Physics subject test if you plan on taking it (I would strongly recommend you to because you plan on taking AP Physics 2 which covers the remaining concepts).