Assalamualaikum Ustadh, How can I revise all the materials, like notes/what to memorize or even the whole book if I want to, for each different lessons, if my memory is weak and understanding? How do the Ulema memorize so much things and also revise them all?

Ustadh AbdulAziz al-Haqqan

By summarizing, it is extremely extremely beneficial and there are different ways to do so, by making notebook or u can do what i do, I underline, write, and put marks with different meamimgs on the book itself.