A refinement to Bluebeard's method is to work out the speed & heading corrections for 30, 45 and 60+ degrees when you're on the ground. Write them down on your flight planning sheet. Then when you've worked out your required track it's fairly easy to see roughly how much of a crosswind you've got and just apply those figures to the track and airspeed to get your heading and groundspeed.. .. .Don't forget to let the examiner hear you adding on the correction for variation, too.