How do i complete metropolis street racer

How do i complete metropolis street racer

Hello, i am just here to ask if anyone knows any helpful answers to these questions i have posted below:

can anyone please tell me which car to use to beat all of chapter 24; & which car i need to use to beat the championship in chapter 25, because i want to clear the game.

but i am also asking these questions because i would like to unlock the remaining cheat modes, the remaining locked vehicles, & the rest of the special races in the game.

my final request is this : does anyone know how i can add the final missing circuits to my track list?

i would be really grateful if anyone knows the answer to this question because i am super stuck with the game & just need a helping hand from someone.

thanks.