1) It seems like you are using the single quiz page for quizzes, so when you submit the quiz the back to course button is just below the check the results button, refer:
http://prntscr.com/cblb2x
OR
You can try using the in course quiz feature, to enable this go to wp-admin->lms->settings->enable in-course quiz, and enable this feature now the quizzes will open in the course status page itself like a unit.
2) For this please make sure you have selected the auto evaluation question types in the wp-admin->wplms->course manager->auto evaluation question types.
The question types selected here can only be auto evaluated.
Let me know if this helps.