Hello Chandhu,

To get into top NITs you need a rank below 7k and to get CSE a rank below 4k is required as the cut off for CSE is comparetively high as compared to other branches. Rank is something which can vary every year as it depends upon the factors like difficulty level of the paper ans number of students appeared in the exam and much more but still to get a rank below 7k you at least need marks above 200 so I don't think 125 will be enough to get into top NITs even for other colleges like DTU you need to score above 150+ You can wait for the cut offs else I suggest you to go for other enterence exams like UPSEE, ComedK or look for some good private colleges for a backup. 

Your can determine your rank with the Career360 jee mains rank predictor by going through the following link 

https://engineering.careers360.com/jee-main-rank-predictor

Good Luck