1) On the Classwork page, click "Create" and then "Quiz assignment".
2) This opens the Assignment dialogue box and automaticaly creates a blank Google Form.
3) Select the number of points you want to mark the quiz out of and then click on the Blank Quiz to open it.
4) Change the title and click on a question to edit it. For more info on making quizzes with Google Forms go to Baz's website here.
5) Enter the possible answers. If it's a multiple-choice test from a book, I would just add the possible letter options to keep it simple.
To tell the quiz which answer is the correct one, click on "Answer Key".
6) Here, you select the correct answer(s) and also enter the number of points for that question.
7) Once you've made the quiz, return back to the assignment and click "Assign" to assign it.
8) The student will see the assignment on their Classwork page as always. they just need to click on the Form to open it.
They will see the form to fill out, not the edit version of it.