what are the steps regards to become astronaut

You need to be physically fit, there are examinations, mentally strong and should have great stamina. You should qualify the criterion of height, a particular level of height is required for people to become an astronaut. You should possess great mathematical skills, and I am not talking about addition, multiplication etc. You should have good communication skills, you must be good at English because there are very high chances that people you will be working with will not even be from your own country. You should have a good academic career and team spirit because all the space missions are done in teams, and you should be able to work under high pressure and in cramped environment.