Which practice test?

The one available at mba.com site

Ok. So you've taken the right test before the actual exam.

You may expect around +/- 30 points from your practice score in real GMAT. This means that you could expect your score to range from 570 to 630.

Realistically speaking, you can't do much about your studies or improving your practice test scores in the last 5 days. What you can do is review your flashcards thoroughly to get hold of the concepts cold, work out questions that you got wrong before while practice, read passages from the internet, eat healthy food, and get some really good sleep.

Thanks for the post!
What surprising is when I solve questions I do better. I always run out of time. Any tips how I do time management better?

I had 550 is that ok?