Hii!
There are amole of career opportunities and fields which you can choose from.after completing class 12th. Mostly the courses such as MBBS, BDS, BHMS, BAMS, engineering etc., Are prefered by the students in government Colleges. But, as you have asked about courses in private Colleges in Rajasthan, let me suggest you some options. You may decide from it, in which direction your interest is.
You can go for courses such as agriculture, BCA, BSc Nursing, information technology, forensics, visual communication, physiotherapy, Paramedical courses, BSc in any Subject such as Physics, chemistry, mathematics, biology etc.,
You can also go for Subjects related to different streams such as management, journalism and mass communication, defence, law etc.,
Hope this helps.
Good luck!