Hi there,
There is no problem if you filled the wrong details. Just change it when the correction form time will come. Or if you can't do that then also. Then also just make an application and email to the helpdesk.
And for preparation just study all the topics of the syllabus and focus on the key points. Stick to the basics.
I hope this help
Application | Admit Card | Result | Dates | FAQs
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile