Hi Pravallika, first of all double check your registration id and password , which are there in the mail sent from sbi. Once its verify just try to find out sbi clerk prelims admit card in google. You will get many webpages , from any page just check for direct link to download sbi clerk prelim admit card. In new page check whether its for sbi clerk admit card or  mock test admit cards. Because many websites are redirecting to that mock test page. If any of above is not working, kindly call in sbi helpline number which you will get from sbi official website. Or just draft a mail on helpline mail id. Hope this is helpful to clear your dilemma. 

All the best for your exams.