I like to study when I'm high. I roll a fatty in the morning and smoke it over a period of 3 to 6 hours while studying without a pauze. It takes more time to study something while stoned but I'm somehow less impatient and hasty in my studying. I'm also more interested and absorbed by the new things I learn. Then my thoughts drift around the topic I'm studying, creating a context and showing interesting associations. A good idea is to review the matter while being sober, focussing on remembering.