Surprisingly, this worked so great for me. Usually, I would use an app to time myself for only 50 minutes then I would take 5-10 minutes break each time. During those 50 minutes and breaks, I was still having a hard time focusing despite putting my devices a downtime. But I was surprised to be able to finish studying in the continuous span of 90 minutes and I got to do it twice! 

First, the power naps. Now, this! Wow. You're a genius, Sir!
Kaboom! Thanks, Margarita! :)
Batang mabuti