hiya, sorry to hear your teachers are so inconsiderate ☹️ If youre set on becoming a lawyer, you will need good a levels, which ideally means going to a good sixth form that will help you chase the grades, otherwise its lots more work for you (honestly, I know. I am at a grammar aiming for A/A stars now, my friend who was same as me at gcses, 6/7/8s, she is now getting C/Bs at a levels at our old state school). Most colleges/sixth forms ask for 5/6 to get in, if youre looking at a grammar (i would highly reccomend if you want As at a level) then they will most likely be looking for 6/7s. Im sure you can put the work in, 5 weeks is plenty enough to do past papers from physics and maths tutor. I would reccomend getting your parents/carers to push the school to move you up to higher tiers again if your teachers are stupid enough to not believe in you. Good luck!