Hi aditi, 

Following is the list of best colleges for bca in dehradun-

1) himgiri zee university, Uttarakhand(44,000 per annum) 

2)graphic era hniveraity, uttarkhand(~1lacs per annum) 

3)quantum university, uttarkhand(65,000)

4)IMS unison university, uttarkhand(91,100)

5)Himalayan institue of technology, uttarkhand(64,000)

6)DIMS, doon institute of medical sciences, dehradun(12,500)

Hope this helps.