want to know how to pass?

It's normal that you feel it this way and everybody else does feel the same as you do because they are as anxious as you are in grabbing that position you're applying for. Well there is really no secret on how to get the job you want except of course you have to show to your employer that you are capable of performing the job they are offering to you. If you do that most probably you will be hired by that company. That is why it is important that you don't show that you are nervous and be confident when in front of your interviewer. Also, be aware if this is your first time to be interviewed that you may or may not get the job this fast unless you have a very good credential with you that they may hire you immediately. Do not be discourage by that rather expect that to happen in the first few interviews and in time you will get what you want.