deepika , have you tried preassessment testson the site. they have mentioned on their site that you have to take pre assessment
test , as many times as you can .because the questions are selected from the vast pool of the database. It can give you good idea of the actual exam. Please do that first. Pass the pre-assessment test with 75% or more marks . get the electronic coupon & appear for the real test.
have you finished books as mentioned on IBM's site ?
1. UML distilled: - martin fowler
2. applying
patterns with UML : - Craig larman
become strong conceptually & you can pass any test.
I hope this is helpful to you.