hello! so i have an offer from my school for history, maths and computer science, however i would like to swap comp sci for spanish. my school says that i can send an email on gcse results day if i'd like to make changes, but they cannot guarantee another offer because they are oversubscribed in many subjects. if i email them to swap on results day, am i likely to get another offer? or should i just accept my original offer and ask to swap in september when i definitely have my place at school? which is more risky?