Hi hiiii, so my school works kinda different (in terms of which subject are given and that we are able to chose) but I'll tell you what they told me before starting this school year (I'm DP 1 year)
1. Taking bio and chem HL must be a great option! As far as I know there is a biochemistry topic so it would come in handy to be in bio, but beyond that they are quite close, if you understand chemistry most things in biology will come much more easier and you'll have more knowledge on both as they complement each other. Now academically speaking it must be quite rough (I'm doing both bio and