i would suggest you to look at the reviews for the individual courses to see for yourself if you think you'll be able to manage the courseload or not.
2a03 - this was a relatively light course load when i took it last year. but it's being taught a sessional this year so therefore, there may be differences
2b03 - this course is interesting but involves a huge load of memorization for midterms and exam. there is also a tutorial
2f03 - haven't taken it, but i hear its a great course!
bio 2d03 - taught by dr. cameron, it wasn't particularly hard or heavy course load. the midterms were easy as they were all online, labs were pretty interesting, and there was a fair amount of material on the final exam that requires some diligent studying
psych 2b03 - i haven't taken this course, but see reviews for it!
imo, it's not the easiest of course loads, but i wouldn't worry too much about it being crazy heavy.
just keep up on all your readings and study hard. haha, should be fine if you're interested in these courses that you've chosen!
good luck!