A grades are given to the top 20(ish) percent of candidates, and considering everyone else will have been studying the subject for nearly a year, you'll be severely disadvantaged. Also, you'll be self-studying making it harder.
Sure it's possible, but 2hrs a day is just over what I did in 9 months to learn the syllabus. If you're going to do it make a revision plan and stick to it so that you can fit in the modules, plus revision.
Only you can know if you're capable of doing it, everyone learns at different rates.
Plus (this is a guess but) if the 95% is about getting into Oxbridge, as long as you have four As at AS they'll consider you. - my friend received an offer from Oxford to do Chemistry having only 90 UMS average.
From someone who got an A in OCR Chemistry AS last year
(Sorry if this comes off as negative, just trying to help 😁)