IIT

Hello,
You should have minimum 55% aggregate marks in graduation and you have to clear JAM, on the basis merit you can get IITs.

The average salary fluctuates between 8-10 LPA depending on the number of recruits.
In the year 2015, Samsung Research, newly set UPAT B'lore recruited more than 10 students and offered 14 LPA CTC. This does't happen every year. Biggies like Microsoft, Flipkart, Amazon etc. take 1 or 2 students only and sometimes none. The highest package of around 52 LPA has been offered by Facebook for overseas posting. Facebook did not come this year. It came for internships in 2014 but took no one.

If your JEE Mains marks are good then apply for state counseling. Although there are still some colleges who give admission on the basis of JEE Advanced marks. Check for such institute and assure your seat there.

I recommend you to visit (josaa.nic.in) and check the last year's ST cut-off of your home state NIT. There, you would get the idea for your selection. And for IITs admission are purely based in the rank of JEE Advanced.
Best of luck.

Hello Aman,
The minimum marks in 12th board to get admission into IITs are 75% for unreserved categories while it is 65% for reserved categories. As you don't have the required score, you cannot get a seat at the IITs. So, you need to give improvement exams or you can try for any other colleges.

Yes, but you have to give the improvement exam for all the five subjects of your 12th class. Only then your improved score would be considered otherwise your original score (unimproved) will be considered for the admissions.
Best of luck.

To get admission in IIT, you should satisfy the following criteria:
1) 75% in 12th board (65% if SC/ST/PWD)
2) Cracked JEE Mains and Advanced exam.

No, IITs do not consider the percentage of PCM, they just consider the rank of JEE Advanced exam for the admissions.
Best of luck.