Hi Aspirant,

NIT (National Institute of Technology) is Autonomous deemed University, There are altogether 12 NITs Across India. JEE Mains is the common entrance examination for Bachelor of Engineering Program, As Your son have secured 59.99 Percentile JEE Mains General Category, You rank would be in between 385534 - 264383. This rank range may varies year wise due number of candidates applying for JEE Mains and High competition for NITs and IITS. We  will provide you the JEE Mains Cut off for the year 2021, Based on that you can check under which NIT University you can get admission.

• NIT Arunachal Pradesh - 25460 - 37919.
• NIT Agartala - 16955 - 30028.
• NIT Tiruchirappalli - 1373 - 5968.
• NIT Warangal - 1980 - 9234.
• NIT Jamshedpur - 9434 - 21256.
• NIT Delhi - 7286.
• NIT Durgapur - 9193 - 19908.
• NIT Surathkal - 2156 - 8980.
• NIT Meghalaya - 16156 - 32063.
• NIT Manipur - 26160 - 35764.
• NIT Hamirpur - 10015 - 22198.
• NIT Goa - 10587 - 21230.

This are opening and closing rank for all NITs for the year 2021. Unfortunately You would not be getting seat in any of the NITS. Don't worry you still have good percentile, you can opt for other colleges. If you aiming for only NIT then give a year break and study well for JEE Mains and get a excellent rank. For more Details of NIT Colleges you can refer below link attached. All the best for admission, Hope you find this information helpful.

https://engineering.careers360.com/colleges/list-of-top-nit-colleges-in-india

Thanks & Good Luck!...