I am 12th appearing PCB student what is the cheapest field in this stream with some scope

Dear Garima, you can go for simple graduation i.e B.Sc. But then after it you will have to give some competitive exam for job. If you don't want to go for MBBS, BDS etc expensive professional courses, you can try for Physiotherapy, Pharmacy, Occupational therapy, Vocational therapy etc. These professional courses are going to cost less and are going to get good package for you.
There are many reputed universities/ institutes offering these courses.

The user recommends following institutes
Postgraduate Institute of Medical Education and Research, Chandigarh

Dear Garima, you can go for simple graduation i.e B.Sc. But then after it you will have to give some competitive exam for job. If you don't want to go for MBBS, BDS etc expensive professional courses, you can try for Physiotherapy, Pharmacy, Occupational therapy, Vocational therapy etc. These professional courses are going to cost less and are going to get good package for you.
There are many reputed universities/ institutes offering these courses.

The user recommends following institutes
Postgraduate Institute of Medical Education and Research, Chandigarh