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Which one would be better?

February
Pros: Coming off a fresh study session for October, so the material is still on my mind somewhat

June
Pros: More time to study, afternoon start time (is this still true?)

The afternoon start time is what is clearly a big plus for me, the only time I can study is basically at night due to classes and such, an afternoon test will probably be better for me in terms of mental preparation.

I would suggest June because like you said, you'll have more time to study. Don't worry too much about whether everything will be fresh in your memory, it only takes a few days to refresh yourself. I retook in June rather than February and I felt it was the right decision. The afternoon start time was actually a huge plus.