Hello aspirant....

Hope you are doing good.

your question is regarding how the exam is conducted and what are the exam centers and you did not mention any name for the exam. but looking into your student profile, I got to know that you are a science student, but even then I am unable to answer your question as there are many exams being conducted for science students. it is not clear if you are asking about any entrance exam or scholarship exam or any other exam.

please make sure you mention the name of the exam you want to about next time when you are asking the question and please ask the complete question.

hope this information helps you...

All the best.