1) not always, only if the second course is useful/interesting to you. For example a lot of people take math 1LS3 but not too many ppl take the 1LT3 course. Chemistry is one of those courses where you would probably like to that the 1A03 and 1AA3, mostly because you need 1AA3 for organic chem in 2nd year. So the answer is you dont have to.
2) Yes you can, a lot of the time people decide to take courses from first year just to open up new upper year electives (since the 1st year courses are pre-reqs)
And as for physics. Taking 1B03 physics you can almost expect a poor mark unless you are some physics master :p. The class average at the exam and midterms was just above 50, so it was definitely not easy. However. there are a few 2nd year science courses/programs that require 1B03 physics so keep that in consideration when selecting you courses, rather than exclusively worrying about gpa in 1st year. Also if you are planning to take the MCAT at some point, 1B03 physics teaches a majority of the physics MCAT component
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