Snail race (maths probability)

Snail races probability game

the snail race is a probability where you have twelve snails and two dice. lets just say you roll a five and a two that makes a seven so snail number seven get to go up once. The worst snail you could get was number one since you can't get a one on two dice, the best snail you could get was number seven since there are three of ways of getting a seven.
the results on our game were:
ben: snail number 5 : 5 points: 5 matthew: 3 - 7 cath: 1 - 8
matthew: 7 - 5 luukas: 9 - 3 lulu: 6 - 1
after doing the race our teacher told us a trick to what snail wins the most

these are all the possible outcomes for rolling 2 dice, and it turns out that we were wrong,we thought that 6,7,8 were the best ones to role, but really 7 was the best, thanks to that table.