Hey

After 10th (NIOS without Maths):

Most Diploma in IT / Computer Engineering courses require Maths. So generally, you cannot apply directly.

But here are Alternative options you can consider

Do 10+2 (NIOS) with Mathematics and then apply

Take Maths from NIOS as an additional subject

Apply for short-term IT courses (web development, programming, software testing, etc.)

After 12th without Maths:

You can apply for BCA, BSc IT (in some private colleges), depending on eligibility rules.

Best suggestion ( as per my knowledge)

If you want a strong future in IT, complete Mathematics from NIOS. It will open many more IT and CS options for you.