These things have helped me:
Dedicated study/work space.
Post-its and highlighters in multiple colours.
Make v v important notes to stick on the wall beside desk to remind you of main points
Making notes of points to remember while reading helps me retain information, plus I have handy brief notes to look back on and refer to. I like the Oxford A4 notebooks. Nice smooth paper.
Reference everything I read in zotero
Don't get behind, ever. Semesters/modules go faster than you think, and even though I work hard from day 1, I still feel the pressure as it ramps up to submission time.
Say yes to any opportunities that will build relationships or help you in some way, even if it scares you.
Don't watch an addictive binge watchable show during the semester/study block. It will eat into your time and you won't properly enjoy either! Just save everything to binge watch during the breaks. Movies on a weekend evening during term time are permissable
(it's just what works for me!)
Meditate. Have breaks. When you're too tired and nothing is going in, don't flog a dead horse.
Get involved with and help your fellow students, unless they're complete dicks or unbearable of course!
And plan treats for when you're on a break/work has been submitted!