Quizmaker 5 branches > quiz > exit

Hi,

I need to have a 5 role-based quizmaker branching. If you're a baker, this is your role & branch, etc...

At the end of each branch will be a quiz.

Once the user passes that quiz > congrats > out you go.

I can envision a nightmare when users hit the back button or somehow gets onto a wrong branch.

Can someone please walk me through best practice or point me to a similar example ?

Thanks