Is all my work for nothing?

guyss Im tweaking bruh!

I am so tapped in when in comes to school, well atleast I try...

I study up to 15hours per week and I am still so bad.

I take meds and they fuck up my ability to concentrate and 3 different doctors have suspected adhdbut getting the diagnosis is a huge efford and I dont have the time for that.

People I know study 2hours and are better than me and to be honest I just cant do it anymore.

I am drained and everyone tells me that I am doing "too much" and I am just getting more and more stressed and drained.

Can anyone recommend study methods for people that struggle with concentration?