You should have bio and chem before you tackle AP bio. And you don’t ‘have to’ take AP Bio.
If AP euro is a sophomore class and you’re doing ok in history this year, it may be worth taking. But when they say 2-3 hours do they mean a week or a day? It shouldn’t generate more than about 30-45mn of HW per day (*5) except during finals.
What other classes would you be taking?
What colleges are you aiming for, in terms of matches/targets?
What State do you live in?