Dear Shifna, you havent mentioned which entrance examination neverthless this is the general information that is applicable for almost all Entrance examinations. Youbfirst register to the particular exam at their official website. You have to use an email and Mobile no# to register. Once you register, you will have tp login with those details, fill in the application form. That is complete the registration process and then eventually you will be taken to the payment screen. Now that is when you make a payment. The applucation is considered successfully submittes only if the payment is done. So its registration first and then it is payment.