Procedure to join NASA after 12th standard

Can you tell me the complete Procedure to join NASA after 12th standard???

[Quick Sam]

No you can not join NASA after 12th standard; NASA is one of the top organizations in the world. Here is the NASA eligibility to become Astronaut:

Eligibility:
The applicant should hold Bachelor’s degree from an accredited institution in engineering, biological science, physical science or mathematics and you need to appear in the entrance examination of the ISRO and some work experience in ISRO are also required.
NASA Astronaut details