Science

All three courses are different specializations. Here, I will try to define all three specializations, so that you may be able to decide which course you are better suited to pursue after class 12th.
Anaesthesia plays a very important role in the practice of medicine. Using anesthesia during the surgical procedures has pros and cons.
Anesthesia enables patients to go through the operation safely without feeling any pain.
It helps the anesthesiologist to carry out operation easily and efficiently.
B.Sc in Neurophysiology involves working closely with patients of all ages to investigate the functioning of the nervous system in order to diagnose and monitor neurological disorders, such as epilepsy, strokes, dementia, nerve and muscle dysfunction, and multiple sclerosis.
Physiotherapy is a Science that helps improve movement dysfunction, and promote functions of the human body and optimal health. This involves assessment, diagnosis and treatment of disease and disability through physical means.

There are many good science colleges in India, wherein aspirants can choose to study Bachelor of Science right after their Class 12th. However, aspirants are informed that in order to pursue a Science course at any of these colleges, they will have to appear for an entrance. In this article, we have listed some popular B.Sc. Entrance exams in the link provided below that Science aspirants should consider giving in order to secure admission in a good college.
https://www.shiksha.com/science/articles/top-bsc-msc-entrance-exams-in-india-blogId-13484
Some of the best universities/colleges, where you can pursue B.Sc in Physiotherapy are mentioned below:
1) Christian Medical College - [CMC], Vellore
2) Madras Medical College - [MMC], Chennai
3) Sri Ramachandra University, Chennai
4) Government Medical College - [GMC], Nagpur
5) MS. Ramaiah Medical College, Bangalore
Admission process may vary for different institutes, however most universities requires it's students to have completed class 12th examinations with a minimum of 50% marks, or it is equivalent to Science stream with PCB as their main subjects to be eligible for the admission process.
BPT Course: Admission Process
Interested eligible candidates are offered admission to the course in India, mostly on the basis of performance in a relevant institute-specific entrance test. Often subsequently, two additional rounds of Group Discussion and Personal Interview are held for assessment of the candidate's general aptitude for the course.
Listed here are some of the top entrance examinations carried out in the country for admission to the course.
CET (Common Entrance Test)
Guru Govind Indraprastha University Physiotherapy Entrance Exam
JIPMER All India Entrance Exam.