marge
bonus mission
races
buy willies tractor
wager races for 1700 coins
missions, collect stuff along the way. finish 100% before last mission

apu
immediately do nelsons race
grind for 2550 coins
milhouse race before first mission
race after kinky frinky
missions, collect stuff along the way. finish 100% before last mission

bart 2
wager race after frink mission to 3000 coins
observatory race
dock race
circuit race
bonus mission before last level
cleanup everything, making sure for 100% before completing last mission

wager races until 3600 coins after mission
complete as hundo would
don't buy any cars until after autopsy part 2
after part 2, 100% everything then finish the game

homer 1 the ultimate return
coin grind for 250 coins
complete 100%

bart 1 part 2
coin grind for 1000 coins
finish off 100%

lisa part 2
TICKET
finish off 100%
coin grind for 500 coins
DONE!