Getting a single C (if you can get it to that) won’t kill your strong academic record. Likewise, having a single withdrawal when you have an otherwise excellent record. A withdrawal will probably raise more questions than a C though…just because it’s more unusual. Either way, you may or may not get in to a top top school…and it may not be about this class. Admission to schools with single digit admit rates is just so unpredictable.
Are you feeling overwhelmed with workload overall, or just struggling to master this subject?
If your workload is overall too much then it might make sense to withdraw to give yourself more time to do well in the rest of your classes. If the problem isn’t an overall sense of having too much work and too little time, but is more of one of understanding the material, can you get a tutor? It’s not too late to pull the grade to a C for sure, and maybe even a B (minus).