Sometimes I study in silence but when there are distracting noises around (people whispering to each other, typing on their computers, packing up theirs stuff) I usually have to listen to non-distracting music. I don't us this very often, but below is a couple examples of a songs in a "study music" playlist on Youtube that someone made.
   Not all of the songs are good for me to listen to while I study, but I'm sure they would work for different types of people.

   I have a blog post about making and breaking habits in my Health & Fitness blog. It's highly relevant to ADHD behaviors, so you should check it out.