What year are you? You could retake them next year, if time permits (ie, don’t bother if you’re a senior; and if you’re a junior you may have others to prepare for, so a matter of priorities). I’d only worry about the Chem, and only if you are interested in STEM / science majors. You don’t get credit at most highly selective schools anyway; you just place out of a class if you have a 4/5 (sometimes 3). But at competitive schools, you may not want to place out anyway. I know people that did that with Calc and Chem and then were getting D’s in the next level…not a great way to start freshman year, esp in their cases as Pre-Med.