i got a grade 9 in English Lang, history, Sociology and drama (and my other grades were 8,7,6:7 and 6)
at your point i revised for end of topic tests and did homework to the best of my ability but nothing more than that, i built this up and my end of year 10 mocks involved like 2/3 weeks of what id call full revision (2-3 hours each night split across my lessons), took the summer off pretty much to be in a good place for the next year.
for year 11 i did a similar thing and started full revision during my second to last set of mocks which was feb-March time, i then continued this until may/ June but I’d say it’s more common to start this in the Easter break, it’s just up to you.