The Pomodoro Technique has done wonders for me, I use it for everything from Islamic studies to computer programming. There are apps and websites for it.

Try the Pomodoro Technique. Set a timer to focus on tasks and then take breaks between. We live in an age of endless distractions.

Try the pomodoro technique, there are some apps and websites for it. It helps me a lot when studying algorithms and higher level math.

Calculus is really not that hard, just take your time to learn each element one at a time. I spend 11 hours studying algorithms yesterday thanks to this technique.