Hello Ankita,

Yes there is a common entrance test for bpt in pgi Chandigarh. Any student with a minimum of 50% aggregate in physics, chemistry and biology in 10+2 is eligible to write the exam. Also, student should definitely be 17 years or above. 

Entire course is of 4.6 years that includes 6 months of internship.

Hope the information was helpful.

Good luck!