Kudos to Akeeba Team ... great job guys
1. Control navigation (go forward / backward)
2. All the quizzes are timed
3. There is no way to keep a quiz open even after user completes its (just in case he wants to re-take for better score)
4. Random questions need to be more robust and pick up various questions from various question-groups randomly or pick them based on a algorithm .. like 3 from group a, 5 from group b, 10 from group c
5. Didn't see an option to attach a question to quiz based on question-groups
Thanks you very much for your suggestion and Feedback. We added your requested features in JE online exam.