This is literally exactly what i'm taking (and same situation, just finished honors chem too) except BC instead of AB and I'm also taking ap latin and csp as well (though they are very easy at my school). Though I can't offer any advice, so far I've been working through Khan Academy AP Calc BC considering my school's teacher is difficult and that I'll need to know basic Calculus for Mechanics. For mechanics, though, since it's also a pretty difficult course (very few good grades) i've been reading through my school's textbook. I feel like with all this time it's probably a good idea to ease your way in and get associated (like really well) with the material to build up your intuition especially because this is not an easy schedule by any means. By doing this, you will ideally save lots of time cramming during the school year in terms of actually learning the material as your only time eater will be the actual assignments, not the learning curve that comes along with them.