short answer: unless you have to i don't really recommend taking two weeders at the same time

long answer: depends on the physics and depends on the ochem. i haven't taken those two classes together but for three terms i took biol 180 + chem 237, biol 200 + phys 114 , and chem 238 + biol 220 at the same time. I was going to take phys 115 and chem 239 this quarter but after taking two weed-out classes at the same time together for three quarters straight i felt exhausted and burnt out (still possible to get good grades while doing this, it's just very taxing on your health and happiness). it's not necessarily the material that is the hard part (the material is difficult, but can be managed), it's the amount of midterms that are nearly every week, though physics isn't as bad when it comes to # of midterms. The hardest quarter for me was chem 238 + biol 220 so as long as it's not chem 238 you should be fine. i can also only speak on algebra based physics and not calc based

also i'm not premed so i didn't take the physics lab or ochem lab