need some help with making my score work for my coop racing game

I'm doing this for my class and my teacher recommended I look online so here I am. I need help with making it so when you cross the finish line it adds a point to your score which seems easy enough but I'm very new to game maker. I also need it so player 1 can have a different score to player 2 and once a player gets 3 points the level changes. This is just one of the many things I'm having trouble with along with making a main menu which you can customize you car and getting the numbers for...

need some help with making my score work for my coop racing game