Hello...
Yes definitely you can. But this year entrance exam is over so try to appear next year and I am attaching all the details below:-

• You can get the post of sta-b mathematics through ceptam yearly entry.

• You have to clear two rounds of written exam.. ie.. Tier1 and tier2.
• Keep in watch of next year's ceptam recruitment. Probably in March end or in april starting ceptam9 recruitment will be start in next year.

• So start preparing for now don't wait for recruitment announcement.

For keeping eye on recruitment process always check this link:- https://drdo.gov.in/drdo/ceptam/ceptamnoticeboard.html

For detailed insight of this exam refer to this link:- https://competition.careers360.com/exams/drdo-ceptam

For any further information feel free to comment.