This information can be found on the ETS website . Download a practice test and try it out beforehand. Be sure you're familiar with a computer as the GRE tests are given on a computer, not paper. You are penalized a bit for guessing, so try to make informed guesses if you must. At least with an informed guess you have more of a chance.
All questions count the same, so finish the easy ones first, then go back for the hard ones.
Above all, try not to cram right before the test and wear yourself out. This isn't the sort of test you can study for overnight. Inc. All rights reserved.