A couple of comments on RoboLab. The difference between it and the NXT-G software is mostly appearance and layout. Where NXT-G might have a motor block with several options available in the control area of the screen, RoboLab uses special palettes to select each non-default setting. The hardest part of the transition is learning where the various palettes are.

Here are some RoboLab Podcasts ( http://www.legoengineering.com/podcasts-submenuteachingresources-114.html ) that will probably be helpful: I think this is a useful order to watch them in. Your mileage may vary.

Introduction to RoboLab 2.9: http://legoengineering.com/podcasts-submenuteachingresources-114.html?view=podcast&podcast=8

Understanding the RoboLab Tools: http://legoengineering.com/podcasts-submenuteachingresources-114.html?view=podcast&podcast=10

Wiring Basics: http://legoengineering.com/podcasts-submenuteachingresources-114.html?view=podcast&podcast=17

RoboLab Defaults and Modifiers (fun with palettes) http://legoengineering.com/podcasts-submenuteachingresources-114.html?view=podcast&podcast=11

Using Lego Motors with RoboLab: http://legoengineering.com/podcasts-submenuteachingresources-114.html?view=podcast&podcast=13

Using Jumps in RoboLab: http://legoengineering.com/podcasts-submenuteachingresources-114.html?view=podcast&podcast=21

Using Forks to Make Decisions in RoboLab: http://legoengineering.com/podcasts-submenuteachingresources-114.html?view=podcast&podcast=18

Time Saving Tips for RoboLab: http://legoengineering.com/podcasts-submenuteachingresources-114.html?view=podcast&podcast=16

Advanced Motor Control with RoboLab: http://legoengineering.com/podcasts-submenuteachingresources-114.html?view=podcast&podcast=7

Probably won't need this for the competition, but useful.

Using Containers (Variables) in RoboLab: http://legoengineering.com/podcasts-submenuteachingresources-114.html?view=podcast&podcast=19

These podcasts are created by Eric Wang, author of the programming book Engineering with Lego Bricks and RoboLab. He's on the Mechanical Engineering Faculty at University of Nevada, Reno.  http://www.unr.edu/me/faculty/wang.html