As Salamu Alaykum,
I have been a victim of black for years and its been about one year since my concentration/focus on my studies is bad, but I used to be a bright student. My memory isn't very good too and my brain has been weakened. Now I'm behind in my studies. How can I improve my focus and concentration and remove the black magic that is affecting my education? Is there a special du'a or anything to read? JazakhaAallah khair. Please reply thanks.