Hi,
My quote is Based on the details provided in "Add a question bank (quiz) feature to a WordPress theme".
I will an e-learning custom question bank/quiz feature to be added to your WordPress website which is based on an e-learning theme. I will add new features according to your requirements like Quiz with a time limit that can be enabled or disabled by the user, Question categories and sub-categories within a quiz that can be enabled or disabled by the user, Correct answer shown with a text explanation and/or an embedded (link provided) video explanation, Retry quiz with only the questions that were answered incorrectly, Randomize question order, Percentage of users that selected each answer shown after, etc.
I'm a WordPress expert, having 10 years of experience. let's have a private chat and finalize it.
Thanks