I think definitely seeing a close group of friends every day was one of the best experiences about high school. It must have been awful for the 2021 cohort who were locked up at home most of the time. One tip I can give you (formally going into Year 12 next year) is to not treat it as a sprint. You've probably heard of this many times before, but consistency and hard work will yield you the best results. Especially during these holidays, yes you may have to do a bit of study, but don't spend the whole 6 weeks in your room, locked up. Still go out to see friends and family, go on holidays (not sure how that's going to work this time round) and give yourself the last 'proper' holiday before a year of consistent grinding and hard work. So basically, do some work to get ahead but do not burn yourself out as this will de-motivate you to continue this next year.