In almost all cases the MRA has chosen at least a 7 row 1st wave. If you finished better than 21st you will be in the first wave on Round 2. Points from last season only carry over to the registration for Round 1. Once the race begins everyone has 0 points, and are scored straight up based on their finish. You can find the "Points Award" in section 7.3 of the MRA Rulebook.