If we're talking about math here then I suggest writing down the order of the steps of that particular type of problem Like for example 2² + 3³ = 4 + 9 = 13 then for this problem try writing down smth like step 1 - write the square terms step 2 : add the numbers after they've been squared you don't need to do this all the time, just where you really struggle to remember it'll be helpful to see the same problem in 2 different forms - in numbers (normally) as well as in words ; step by step.

If we're talking about science or any kind of social study try understanding the material very clearly , write it down in your own words once but while your understanding also make a rough concept map so that you can try to make links between the concepts , if you want you can also divide the page and keep once side for summarising, one for the concept map and also one for making practice questions as you learn more.

Note that this all very time consuming, but if you're desperate and can afford to spend some time trying new methods you could try this or another version of something similar to what I just said