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How was is/was your Physics Degree education?

So, im thinking of studying physics i love the whole ideas behind physics but obviously love isnt enough, need to take into consideration if you're good at the subject right?
I havent done alevels yet so im not sure how i will perform but i want to hear your physics degree stories? What have you learned? What did you wish you would have done differently in school at around year 11-12?
Any oxbridge students i would like to hear from or any other university
Thank you, worried about my gcse reuslts so posting this to get my mind off it