How to prepare entrance exam?

If it is one the standardized exams go get the prep book at the bookstore. Read it, study it and look at their hints on how to pass the test. Get to know the test. Each is different and each has it's own quirks. Just study the book and practice the type of questions they give examples of.

Currently there are online website available that helps you to prepare for entrance exams. It seems very useful- it give a feel of real exam, so that you can be prepared very well.