For context, I'm in y12 and I'm doing chemistry, further maths and maths and computer science. I want to do computer science at Oxford university. My most recent exams were in January where I got an A in computer science, a B in further maths ( I do all of alvl maths in 1st year) and a E in chemistry (the exam was abnormally bad for me, I even accidentally missed pages). My predicteds for the end of year exams are All As and a B in chemistry though. I genuinely have an extreme lack of confidence though. I've talked to my teachers about this, but I don't think I'm going to get an A, especially for further maths despite them telling me I'm on the right track. I've only started proper revison now due to medical reasons since the start of year. I just think all oxbridge students would never have been in my position and if I'm struggling now then I shouldn't even bother applying to Oxford as I won't cope with the intensity or something- is this true or am I just paranoid??