Ooh good luck with your mocks! Dont know the system where you live but I learnt not to stress over them too much since it's the final exams that really count. Still, I hope you do really well! :)
Yeah, science seems the way to go! It's incredibly interesting and diverse. When I went to uni open days and visited the biomedical departments, it got really confusing because everything looked so fascinating!
Hmmm... Not sure what the legal working age would be but in most places it's around 15. Getting one is so worthwhile though - it helps a lot with time management and people skills.
Hopefully I can come back every couple of months if I have free time. It's just so nice keep in touch and hear from everybody! :)