me too same problem
scored 95.84 % in SSLC(10th)
91 in PUC(12th)
got screwed up in CET though(6695 rank)

landed in IT(instrumentation technology)

I hate this branch

I have 1st sem exams from 24th....

Lab exam tommorow(chemistry

)....

Have secured less marks in 2nd internals...
The one thing i liked is free internet in my college


....
I will spend an average of 1-3 hrs online mainly DIGIT forum


...
In home,spend 5-6 hrs sitting infront of my computer doing something


...
And the most annoying things are boring subjects

like
Chemistry
Electricals
Maths
...
But i will assure myself that campus will not depend upon percentage..
Percentage is just for eligibility.....
I have seen several toppers not getting recruited in campus selection..
So, my conclusion is
Study just for eligibility..No need to get good marks