What should I be doing in Year 11 in march?

Since it's currently coming up to March, should i spend all my time revising because i feel a bit behind. I was thinking about doing a super curricular competition, but I'm worried it will take too much time out of revision as it's a presentation you have to create around a chosen topic. Is doing it now a good idea or should i leave it till next year in year 12?
Also if any previous or current year 11s can give me some guidance on what I should be doing at this time in the year and how many hours i should be aiming to revise after schools and on weekends that would be very helpful thank u 🙏