There are many options for PCM students if you are not interested for Engineering All the options are good & have scope in its field, It depends on your interest & capability. Here are some of the options you can opt as per your interest.

Bachelor of Science in specializations under the pure sciences domain such as Maths, Physics, Chemistry, Botany, Zoology etc.
The other options if you are interested for Management, Commerce or Law programme then you can go for BBA, B.com, B.A LLB etc.

You can also go for Architecture ( B.Arch) exam NATA & Navy, Army through NDA Entrance Exam etc.

You can choose any of the option as per your interest.

Good Luck!