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As level revision

Hi,
I study biology, chem, phy and maths and am doing as levels my exam board has as exams which count for 40% of the alevel. I recently finished mocks and got 4 as. I was wondering how mich revision i need to do for my exams in also please tell me if my plan is good.
My plan:
-do 30mins to an hour a day of revising old content (as1) from now using full past papers
-spend 90% of easter revision (around 4 hours a day) doing new stuff(as2)
-after easter revise as1 again until exams (as1 and 2 have the same weighting)
-during study leave do 9am to 4pm then 1 hr in evening 6 days a week
Is this enough, i think any more will burn me out. And for old as1 stuff should i do ppq or go topic by topic.
Thank you so much!