Greetings !!

Candidates need to clear class XII from a recognized board in order to be eligible for the exam.  After clearing Tier 1, Tier 2 candidate need to appear for Tier 3 exam. SSC CHSL tier-III is basically a skill/typing test conducted as per the post applied by the candidate. So  If you have studied computer as subject in any of your school subjects, it will be Ok. But it would be better if you do a 6 months diploma course in your local area. It is not mandatory.

Stay focused, prepare well, You will be able to clear the exam.if any doubts, pls feel free to ask.

Wish You Good Luck !

Thank You !!