Hello Hitesh,

With a rank of 42000 in JEE mains you might get a seat in following NITs and IIITs:

• Indian Institute of Information Technology Manipur, Heingang, Manipur
• National Institute of Technology Agartala, Agartala, Tripura
• National Institute of Technology Arunachal Pradesh, Yupia, Arunachal Pradesh
• National Institute of Technology Nagaland, Dimapur, Nagaland
• National Institute of Technology Raipur, Raipur, Chhattisgarh
• National Institute of Technology, Mizoram, Aizawl, Mizoram
• National Institute of Technology, Rourkela, Rourkela, Odisha
• National Institute of Technology, Srinagar, Srinagar, Jammu & Kashmir

To find out your chances for more colleges visit the following link:

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

All the best.

Yes u can get admission in nits but u are eligible for JEE advanced so can write it and take up admission at prestigious IITs.