I wouldn’t suggest AP Bio as a student’s first AP course, especially after only 8th grade coursework. It has one of the lowest 4/5 score rates and is known for being difficult.
There’s really no need to double up on science that early. I assume both have labs so they would restrict how many other courses you can take.
Get through Chem, and I’d suggest Physics the next year, then select AP science(s) - you’d still have two years. Find a solid elective to take instead.