Thank you! Alistair and I have been in startups since we were 15/16, and we've both now finished school and work full time in the startup space.
My grades definitely took a down turn the last two years, but I'm happy with my decisions and am loving working in tech!
I think it's fair to say most of us had our grades suffer. My GCSEs back in 06 were terrible, but no wonder, I spent most of my time hacking & writing code. I'm no worse off for it, and I'm sure you won't be either!