When I was doing my internship in Purplle.com ( e-commerce startup in mumbai ) from May 15 th to Sep 15th. I used to work for 10 to 12 hours daily since it is startup, there will be a lot of work to do.
But still I managed to extract 3 to 4 hours daily to study for Gate 2018.
I used to wake up early in the morning at 6 probably I used to study upto 9. ( 3HOURS)
After that I used to get ready and tiffin...etc and reach office by 10.40 to 11.00AM etc.
I used to work till 9PM ( Some times even more ). Then reach home by 10PM, fresh up and cooking and eat fast ( time 11pm ). study till 12pm ( 1 Hour). And go to sleep.
Again woke up at 6AM in morning...
In this way I used to extract 3 to 4 hours roughly everyday to study for GATE.
#What you need is a strong desire.
even though I didn't get a Good Rank in Gate 2018. I just wanted to tell you.
( I can't even imagine .. how I was able do that ... I don't have that much desire to prepare for Interview for IIT's now... May be not a strong desire now )