my aim is to become a doctor ?please guide my question

You need to select Biology (Science) as your subject in PUC. After that, you need to write the CET and clear the same with a better rank to become a doctor.

Medical is one of the most sought out profession in India. Along with Engineering, MBBS is preferred profession for Indian students. To become doctor you will have to take the science stream for Class 12th. To get admission in a MBBS college you will first have to appear in one of the several medical entrance exams.

This is the most difficult part because there are only couple of thousand medical seats in India for which more than 1.6 million people apply. Therefore getting admission in the MBBS college is not as easy as it may seems. Thousands of people fail to crack the entrance exam. It would require months of preparation and professional coaching to crack any of the medical entrance exams in India.

Here are some of the entrance exam where you can appear:

CBSE PMT

One of the most popular entrance exam for MBBS is CBSE PMT. Also known as the AIPMT, this exam is to fill 15 percent of government quota seats in MBBS in India. There are two parts of the CBSE PMT exam. First one is Preliminary exam which is followed by the Main examination.

AFMC Entrance Exam

AFMC means Armed Forces Medical College. This entrance exam is for 130 medical seats in Armed Forces Medical College (AFMC), Pune. Thousands of candidates appear for the 130 available seats every year. There is one condition for candidates who wish to complete MBBS from AFMC. They will have to work as Commissioned Officers in the Indian Army for at least 7 years. This is the part of the agreement which can't be violated later.

AIIMS Entrance Exam

Another prestigious exam in India is AIIMS entrance exam which also offer very few seats but despite that thousands of candidates appear in the examination.

DUMET

Delhi University Pre-Medical Test also known as DUMET is the medical entrance exam for the MBBS aspirants. This exam would give you admission in medical college affiliated to the DU.

JIPMER Entrance Exam

Jawaharlal Institute of Post-graduate Medical Education and Research also offer 75 MBBS seats every year. To get admission candidates are required to appear in the JIPMER entrance exam. The eligibility for exam is at least 50 percent marks in English and same percentage for Physics, chemistry and biology combined.

Apart from these exams, you can appear for the several state based medical exams like CET for admission in the MBBS college.