Not the ideal method I guess, but works for me

In class: I take notes. I sometimes make little doodles (arrows, asterisks, stars, etc.) in my notebook. I may use colored pens (2 or 3 different colors) as visual aid too.

My books: highlighting, summarizing, making notes, underlining, doodling unrelated stuff such as happy faces and cats. LOL.

Tests: The day before a test, my sister helps me out by asking questions based on the test material. I try to answer with my own words whenever possible (i.e. when memorizing specific data is not required). We don't sit down and study. I wander around the living room and the kitchen and so does my sister. I go over the material a few times while listening to music (not loud. After all, I'm trying to read). Music can be anything from upbeat to relaxing. Songs that make me wanna dance are perfect for this. I don't let myself listen to depressing lyrics when I'm studying because I know I'll end up emotionally and mentally drained. If not at home, I find a (relatively) quiet spot at school. This quiet spot must be near a tree and I also need fresh air and the sound of birds chirping. I like to sit on the grass all by myself. It helps me focus. I may take food breaks (simple things: fruits and veggies and maybe some water).