There will be hardly 1 or 2 question about dates. I know it's not easy to remember all the dates ( I got one question about dates and hubby got 2 during our test )
Best thing is to read a book few times and do online quizzes. You will see once you go for your test that online quizzes are harder the the actual test but they help you prepare! Try this links:
I second Mrva21, I suggest you read through the book as was suggested and from my recent experience you probably need to remember the dates for most of the main events through out the history. And yes the test is easier than what you get to practice online but still you need to read and practice enough to answer all questions right or enough that you know you passed.