Yes — SSC CHSL is designed for candidates who have passed Class 12 (intermediate).
You must have passed 12th on or before the cut-off date given in the notification.
Some posts, like DEO, may include an additional skill or typing test.
The age limit varies by post, so check the eligibility section of the official notification.
If your result is awaited at the time of application, read the notification’s eligibility clause carefully.