Jaypee Institute of Information Technology Noida Answered Questions

No. No college offers 100% placement. Not even IIT's. There are students who don't want to get placed, as they want to study further. The college guarantees that even if you are half decent in your studies, you will be surely placed. So yeah, its about 100%. But it depends on you as well.

You are eligible for admission. The real question is whether you will be able to get the desired campus. The cutoff's for different branches are:
Sector 62,
CSE: 80k
ECE: 130k
Sector 128,
CSE: 1.5L
ECE: 3L
So if your JEE ranks lie somewhere in between you will get admission.

The focus on extra curricular activities is good. There are many groups and bands formed, out of which you can join whichever suits your taste. There is dancing, singing, drama, writing, coding, sports, etc.
Saturday might be working. It depends on your schedule. But it is a half day. If you are assigned only one or two classes that day, and luck is on your side, you might convince your Lecturer to shift the lecture permanently!
Uniform is sadly compulsory, but there are perks for that too. Atleast you don't have to get up early and get stuck on eBay to wear. Also you know what everyone else gonna be wearing!

The average package for computer science is: Rs.3 lacs per annum. And that's pretty much the case with every engineering college.
Here, you also get the chance to get into many more companies, which offer - Rs.4 Lacs, Rs.4.5 Lacs, Rs.6 Lacs, Rs.10 Lacs, Rs.12 Lacs and even Rs.18-22 Lacs.

The chances are bleak. You have scored just on the line. The cutoff for the CSE branch at sector 62 is around 60-65k, but if you are lucky you may get first hand admission. Also you have the option of taking ECE, and putting CSE as preferred branch. You might get upgraded. The probability of getting upgraded is quite high.