Hello aspirant,

Well with your rank of 3986 in JEE Main under SC category, you could get a seat in NIT kurukshetra under home state quota. Below I have listed the previous years cutoff for all the bracnhes of NIT Kurukshetra for SC category - 

• Civil Engineering : 7862
• CSE : 1478
• Electrical Engineering : 6428
• Electronics and Communication Engineering : 4705
• Information Technology : 2221
• Mechanical Engineering : 3355
• Production and Industrial Engineering : 8341

Note : These are the closing rank for home state quota.

Now to get admission in NITs, you have to attend the JoSAA counselling process. You can go through this link and checkout the details regarding JoSAA counselling : https://engineering.careers360.com/articles/josaa-counselling

If by any chance you don't get a seat through JoSAA, then you can apply for CSAB counselling through which you can get a seat in NIT. CSAB counselling will start after the completion of JoSAA. You can visit this link and check the details regarding CSAB counselling : https://engineering.careers360.com/articles/csab

Good Luck !!!!