It might be good to get a neurological checkup if your uni has a clinic that could do that or refer you out for one just to rule out anything obvious. On the pr

It might be good to get a neurological checkup if your uni has a clinic that could do that or refer you out for one just to rule out anything obvious. On the practical side of things, Cal Newport (calnewport.com) has written extensively on study strategies. Unfortunately he was just a toddler by the time I was in college so I can't directly attest to whether they work but his writing on deep work did resonate well with me.