Hello Aspirant,

Yes of course you can give if you don't have any affiliated school and pursuing your class 10th from open school because as per the eligibility criteria of NTSE 2021 :-

• The candidate must have qualified class 9th exams with minimum marks as imposed by the state-level exam conducting authority.
• The candidate must be studying in class 10th in a school affiliated with a recognized state/central board.
• Open school candidates studying in Class 10th are also eligible to submit the NTSE form provided that their age is below 18 years and they are not employed.

For complete details about NTSE eligibility criteria kindly check out the link given below :-

https://school.careers360.com/articles/ntse-eligibility-criteria

I hope this information helps you.

Good Luck!!