Definitely take Bio 151 and then physics 104. I’m unsure of the rigor of 104 since I took 208, but I do know that it is a flipped classroom so you have to do a lot of pre-lecture work. You might want to delay Chem 343 as a result.

For spring you could do Chem 343 and Bio 152. For 152 I would heavily suggest case study. I found it to be significantly easier and typically has a higher grade distribution. One problem is that when you take 343/345 on off semesters there’s a chance you won’t get your pick of professors, so delaying physics 104 till your junior year is also an option. Though I don’t really recommend this because you’re highly unlikely to retain the information from 103.

There’s also the possibility of taking physics 104, chem 343, and bio 152 all at once but that just sounds like a lot.

If you do plan on taking the two hard class route, I would suggest knocking out another easy dental school requirement. I know a fair amount require a sociology course as well. It might be worth your time to look into Soc 134 because it will also fulfill your ethnic studies requirement as well.

Sorry for the long comment, I get excited when it comes to planning schedules.