Sure, here's a shorter version of the text:

To pursue an M.Tech in Civil Engineering at IITs and NITs, you'll need to clear the GATE exam. Admission criteria include GATE score, academic performance, and sometimes an interview or written test. The cutoff scores for IITs and NITs vary each year and across different institutes. Generally, a higher GATE score improves your chances of getting into a top IIT or NIT. Top IITs typically require a GATE score of 700 and above, mid-tier IITs around 600-700, and newer IITs around 500-600. Top NITs generally require a GATE score of 600 and above, while mid-tier NITs may require around 500-600, and other NITs around 400-500.