1.No that kind of slackness I never felt as I said it was do or die situation for me.So I didn't want to waste much time.So I always ultilized time mostly in studying.But what I felt bored is to study same notes for one more time as I already took an intense preparation in 2016. And also solving same previous year paper repeatedly was not interesting at all.(Many I even know the ans)But I had no other option. It was boring but that is how you have to prepare. One thing I did was I started reading new books on diff subjects so that I can read same topics in diff ways.
2.Yess..For motivation you need to keep on motivating yourself daily. And that was the purpose for maintaining that diary and reading books.Even in YouTube you will find diff lectures by great peoples that will boost you up.
3.Regarding Interview I am planning to write a separate blog as many people want to know about it.Yes..I will share my experience in both term there.It may take some time as I am a bit busy with the formalities of ISRO joining.But I assure you I will write about it.