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Hello Dushyant,
The best college to pursue the PH.D is the IIT and IISC. Indian institute of Technology (IIT) conducts IIT JAM for the graduate candidates for the M.Sc, PhD, or dual degree from the topmost institutes of India.
The IIT JAM also known as the joint admission test. Youcan apply for the IIT JAM exam if you fulfill the eligibility criteria as per the notification.
https://www.eduncle.com/iit-jam-exam visit here to know in details.
The minimum qualification for the IIT JAM exam is graduation degree with minimum 55% marks in the subject you want to do PhD.
There are no age limit criteria. All you need to check is educational criteria.
IIT JAM exam is conducted for following seven subjects for ehich you can apply:
Biological Science
Biotechnology
Geology
Mathematics
Chemistry
Mathematical statistics
Physics
Apart from the IITs, three more institutes accept the IIT JAM Score card that are:
Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR)
IISER, Bhopal and
IISER , pune
Keep update yourself with the latest updates to know more about the IIT JAM information and apply for the exam.
All the best, have a bright future ahead.

To become an astronauts you have to qualify these basic requirements-
Bachelor's degree from an accredited institution in engineering, biological science, physical science, or mathematics.
At least 1,000 hours pilot-in-command time in jet aircraft. Flight test experience is highly desirable.
Ability to pass a NASA space physical which is similar to a military or civilian flight physical and includes the following specific standards -
Distant visual acuity- 20/100 or better uncorrected, correctable to 20/20 each eye.
Blood pressure- 140/90 measured in a sitting position.
Height between 62 and 75 inches.
Astrophysicists have a high chance of becoming astronauts.
But, if you want to get more detail then please read the given attach files Or you can visit the given officials site -
http://www.nasajobs.nasa.gov/astronauts
http://www.jsc.nasa.gov/Bios

Bachelor of Dental Surgery or BDS course is an undergraduate course in the field of dentistry. This course helps an aspirant to become a dentist.
The duration of BDS degree ranges from 3 years to 5 years. The variation in duration is due to necessity of an internship or a lack thereof. The course can be pursued either in full time mode or in part time mode through correspondence.
Eligibility Of the Bachelor of Dental Science [BDS]
For BDS course, the minimum eligibility criteria is mentioned below.
Passing senior secondary examination with an aggregate score of 50% from a recognized board or equivalent examination
It is required to have Physics, Chemistry, Biology and English as subjects in 12th class
The admissions are taken by conducting entrance tests. The candidates with their senior secondary examination results awaited are welcomed to apply for this course.
How to Get Admission in Bachelor of Dental Science [BDS]
The candidates need to pass entrance exam to secure their place for the course. The most common entrance for the same is AICET BDS. Other than this exam, there are exams like NEET, MU OET, DUMET, AIPMT and COMEDK.
Further selection process is conducted as per the specific norms of the university. There are many universities which go for a counseling process for selection.
Entrance Mode
The top entrance exams conducted for BDS degree are:
AICET BDS: This test is conducted for admissions in the field of dental science for admission in the private colleges for Chhattisgarh. Questions from Physics, Botany, Zoology and Chemistry
NEET: NEET is a qualifying entrance examination for admission in medical courses. It is accepted by institutes like Banaras Hindu University and Armed Forces Medical College.
AIPMT: Being held this year in May by CBSE, it is an entrance test accepted by most of the top universities. The syllabus for this test includes Physics, Chemistry and Biology.
madhya pradesh DMAT: Conducted by APDMC every July in Madhya Pradesh, it is a test that offers entry into a career in the medical field. The questions asked in entrance test are from Physics, Chemistry and Biology.
Selection Process
The selection process varies from university to university. Some of the universities take admission only on the basis of scores in the relevant entrance exams. However, there are some universities which may go for a counseling procedure.