under normal circumstances, i'd say no it isn't stupid, and in fact, its a great idea. i took a gap year to improve my grades, and because of that, it seems likely that i will be able to go to southampton next year, but it also depends on how you interview, and your grades now. i rolled out of school with BCC, but i'm guessing you did a little better. on my ucas i said i was doing more a-levels, but with my current situation, i got 2 unconditionals, one being bristol, and 2 conditionals, one being BBC from southampton. so even with not-the-best grades, you still can get into pretty good uni's if you have a strong personal statement and perform well in the interview. it also depends on your course some, like medical or science you may need the better grades. your aspirations wont affect your ucas, but your personal choice. i would advise you to, unless your the son/daughter of a millionaire to rule out oxford, cambridge and maybe others like ucl, durham - that kind. lets face it, if you are considering to take a year out to improve your grades, you wont get into ox-bridge this year. and with the fees set to rise next year, if you try to improve, you will likely be priced-out.if your grades are AAB then you stand a good chance for UCL, Bristol and duhram this year, and you will escape the fee rise but you may not have the finances to go next year. If I were you I’d also question Exeter- they recently closed their archaeology unit, so seem unstable. As they are in financial difficulty, they will charge highest fees. Taking all that into account, I wouldn’t attempt to improve. But whatever you do, always have a safety option – a uni that is low budget, or doesn’t require A* across the board in case things go tits up. Hope that helps