CAT

Not at all if you take it seriously. One of my friend got 70% in 10th and 81% in 12th and he cracked CAT with 99.6 percentile with coaching. You have to plan accordingly and stick to it until you get to it. Hope it helps.

There is no relationship between CAT and programming. CAT is for MBA.

Its an amazing college. Only if you are ready to study for 12hrs a day, not on weekends.

CAT is the entrance examination accepted by IIMs and many other premier B Schools. MAT is recommended by AIMA and is common entrance for MBA.
All the Best

Graduation with Minimum 50% is the eligibility for CAT entrance. Prepare long term coaching for CAT today. Time is popular Entrance coaching academy in CAT.
All the Best

If you have basic ability you can crack CAT with one year of self preparation.

Although there hasn't been an official confirmation on this, but following the previous year trends, CAT'16 is most likely to be held in the month of November'16.
So, that gives you roughly 9 months for preparation, if you are going to write CAT'16. For a month-wise preparation methodology for CAT'16.
All The Best.

Your academic performance looks impressive and in my opinion you should get a GD/PI call from IIMA if you secure more than 99 percentile.

I am not sure as you would be borderline case for all IIMs and other top colleges. And also as soon as results are out, shortlists are announced. Hence you should not worry about the interview calls. I would suggest you to focus on the CAT and do your best.