It's normal to be nervous and it's good because it shows you care, and if you care you'll do better! GCSEs are important, but it's not the end of the world if you don't do too well. Teachers drill in the importance of exams into you because THEY need good results so they look good! In reality as long as you do your best you're fine, even if you get some things wrong there are always opportunities to revise and redo mistakes in the future. They'll only last a couple of weeks and then you've got a nice long summer to relax and treat yourself with :-) The relief on results day will be great! x