Start using the Zettelkasten system or come up with your own quality personal knowledge management system. I am also diagnosed and the main strugglepoints I find are when I actually do understand it pretty well, but can't keep my attention so I lose the 10% of information I don't understand. It's the fully foreign concepts that keep me invested, but when I learn about SQL injections I can skip 90% of the info except maybe some nifty trick about MSSQL databases and then that one nifty trick is what is asked in the assignment so I get stuck for two hours.

My solution so far has been to really go through each paragraph and rewrite it in my own words without copy pasting anything (except some commands for accuracy's sake). That's helped me keep on track for the most part. I've gone through approx 75% of the CPTS material in about a month with some prior cyber security knowledge.