gcse + a-level time management??

i did my citizenship studies, english literature and english language gcse’s in year 10, and now am completing an as-level in government &
politics in the end of year 11.
for year 9, 10 and 11, my lessons mainly comprised of sitting at the back of the class with my laptop and a few text books, doing 5+ lessons in 1 (year 10 content in year 9, year 11 content in year 10...).

since i'd get the as in year 11, the sixth forms i’m prospective about are willing to arrange for me to complete the full a-level in year 12, meaning I can concentrate on my other 3 subjects (english literature, history and economics).

self-teaching those gcse’s was a challenge but it never felt like i was out of my comfort zone nor did i ever lose passion for them. i’ve found i’m happiest being in charge of my own teaching.
but now I'm doing the rest of my gcse’s and lots of extracurriculars (for some normalcy), i feel that time is slowly slipping away and i don't know the best way to prioritise it.

since the as-level is more demanding than the gcse’s, how much more time should I focus on the as rather than the gcse subjects, especially coming up to the exams?

also, if anyone else has done this or has done it for a different subject, please lend a hand and any advise or tips (or more resources) are more than welcome! <333

(i got 999 + 99998887 in my year 10 mocks)