There are several hotkeys available for taking quizzes.

Navigation (when taking a quiz)

For fill the blank and short essay
Press ↓or Page Up key to go to next question; press ↑or Page Down key to backward to previous question.

For mutiple choice (single answer and multiple answer) and true & false
Press → or Page Up key to forward to next question; press ← or Page Down to go back to previous question.

For click map, sequence and matching
Press ↓, → or Page Up key to go to next question; press ↑, ← or Page Down key to go to the previous question.

Press Enter key to submit a question (if you choose to submit a question at one time) or quiz. Press Home key to go to the first question, while press End key to go to the last question.