I have lost all motivation to give any exam this year. My prep is going okay and the mocks are also good, but it happened last year as well and even after getting decent percentile i could not get into any B School. Is there anything I can do ?

do drugs

listen up bro!
u need some good reason for an MBA. its not jsut about the score. think how it can help u. BY getting a job you are aiming for? a great education in CV or better jump in corporate ladder....
you will get the right Bschool this time if you do the bare minimum each day without thinking of motivation. do it whatever u may feel abt it just do it first!

Having a larger picture on why you what to do an mba and what kind of mba intrests you really help! It's good to aim for the top bschool but is not the end if you dont end up in them. you can consider tier -2 and not so popluar colleges as well, there is surely going to be a lot to learn in any place you step-in, when your sense of purpose is strong it will fuel your learn and growth irrespective of the college or the bschool band.

Sounds like myself! I got 97%ile ad couldn't land even one good B School. GEM with 9/8/8 and nothing for 97 so start preparing accordingly!

any B-school?

Even after getting a decent percentile, you couldn't get into ANY B-school? I find it difficult to understand. What else was missing or required? I'm a first timer so...but remembering why you started in the first place always helps.