I really like it. I think the layout is good, and it looks nice, simple and friendly. It is 100% something I think that I and many of my friends would use to study if it was applicable to subjects we do. One very petty and minor thing, however, is the colour scheme. In my opinion, I think that the central colour is a little dark- if I were in your position, I think I'd go for a cleaner and calmer colour such as a pastel-y grey/blue, with accenting colours that compliment colours present. Another thing I would change would be the search bar at the top. I think I would put it in the main tool bar, just because it is more efficient. Other than that, I really like it! I hope it works out well for you!