Hey Swesksha,
BPT is a 4 year undergraduate degree course in medical and healthcare. The course includes the art of preventing and curing body's pain and functioning.
For admission to this course, you should be eligible according to these conditions :

• You must be of minimum 17 years of age.
• You must have completed 10+2th examinations with Physics, Chemistry and Biology as compulsory subjects with minimum 50% marks.

For admission to the course, firstly you have to fill the application form of a particular (good) college, and if the college conducts any entrance exam or interview for the admission, you have to appear in that and earn a good score.
For more information, you can refer this link,
https://medicine.careers360.com/articles/4569-Course-Review-Physicotheraphy-in-India
All the best!