Hi ravi,

Only documents of class 10 and 12 are required along with other documents which where given to your son by school.

Like

• Marks sheet 10&12
• Passing certificate
• Migration certificate
• Tc

For more details you can refer the link where you can get complete information regarding counselling



https://www.google.com/amp/s/medicine.careers360.com/articles/neet-counselling/amp



Hope it helps