Thanks haha 
You can do them simultaneously if you like, but it might make it more difficult to understand the topics. I assume in school you would be taking these classes at the same time (like I did) so you can do that, but I find it easier to learn the math first before applying it to science, so that you can see how the math relates to it automatically instead of piecing it one by one. Physics is applied math, of course.
For PreCalc you can adjust my timing if you would like and use the “extra” three days to learn the material better rather than review, or keep them in case something comes up.
In any case, let me know how it goes! B-)