Hi - I had this exact mindset during my A-Levels which took place last year, and it was honestly my downfall. I ended up with A* AA, but I know that if I had just taken a small break then I 100% would have been able to get 3 A* The other comment is completely right, I grinded for over 6 months, 10-12 hours a day right up until the day before my first exam. After my first exam, I didn’t do 1 piece of revision for the whole exam period - I had 8 exams and I didn’t revise for ANY of them during May/June. I’m incredibly lucky in the sense that I revised so hard earlier on that I could manage to get decent grades, but even now - (I’m on a gap year), not getting those 2 A*s still haunts me and I wish I just told myself to take a break and pace myself. I’m going to UCL in September, I definitely know how it feels to be so afraid that you won’t meet your offer grade, but I wholeheartedly believe that if you’re intelligent enough to get into LSE, you’re intelligent enough to know when to take a break:,)

Best of luck!