Look, to clear things up a bit.
When you take it is irrelevant - if you feel you have to take it (or if you decide you want to, which is not a bad idea by any means) then take it in second or third year, ideally the year you will have fewer difficult courses.
Taking a 1 year break from 1A03/1AA3 will not be harmful, nor is Chem 1AA3 a predictor of your marks for the two organic chem courses.
You don't have to take them in the summer or anything like that.
Do all the old tutorials, do the practice midterms/assignments before midterms, and go to tutorial/ask questions if you don't understand something. If you do this, you can 12 both of them.
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