You should really just take it as good practice rather than falling into the habit of bemoaning and avoiding it - perhaps do a little bit every day, or few days. I rarely got much going through GCSEs or A levels and the first few weeks back at school were hell for me, as suddenly the workload and level of mental activity I had been used to before the holidays seemed so difficult to get used to again, having had six weeks of doing essentially nothing!
If you're planning to go to university, trust me, it will pay off to be used to being productive even in so-called holidays - I wish my school and college had made more of a habit of giving us things to do. I haven't had a single holiday in my first year of university without often multiple essays and at least a stack of reading to do (the latter more so over the summer now), and it came at me like a smack in the face. It won't kill you to get used to the idea that even if it isn't term time, you should still be aware of and preparing for studies ahead. It's not particularly unrealistic or unfair at any level of study imo.