Oh no! I'm sorry to hear about your home problems, stuff like that is not welcome at any time, but its especially detrimental during your A-levels. I hope it's better now
I guess you have to watch with your course and being a third year student, mainly because Medicine and its related fields are already really competitive. However, I think if you try and bulk up your PS more and obviously get those grades you have a really good chance. You just obviously have to work harder!
I'm sure the universities would prefer you resat and got A*s, then tried first time round and got B's. I definately would talk to your teachers however, although I think if you have the ability to get those grades then I'd definately go for it! Regarding economics, definately talk to your teacher again. Are there required subject choices for biomedics? Do you think they'd look down on Economics because it's not science based? Definately ask your teacher this when you enrol and ask around on TSR threads related to Biomedicine.
At this stage it's unfortunately just the time where you'll exhaust yourself to the max by asking so many questions. Eventually you'll get the answers however and hopefully be on your way to uni next year!
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My situation
Well I needed BBB to do Marketing at Lancaster, but unfortunately got ABC and was 1 UMS from a B
I'm hoping to just resit either the two exams from that subject (Media Studies.. I know.. don't judge me
) or resit the whole of AS and A2 MS within the year (which includes coursework). I'd need like 80/100 on both exams to get an A, however if I re-do the coursework and ace that (thats not set in stone however, it depends on your group) then I could get an A*. Right now however I'd need 201/200 on my exams to get an A*
What are you planning to do other than study this year?
I definately need to make some gap year friends too