Develop a quiz plugin wordpress with spaced repetition - Read the description file

Looking for a wordpress developper to develop a quiz plugin (create from scratch). In the backend, admin can create infinite number of questions (Single Choice, Multiple Choices, True/False, Fill-in, Short answer, Matching, Ordering) with the ability to use media in it, add a hint, add a correct answer explanation, specify a category for the question, its level of difficulty, select the correct answer(s), give positive and/or negative marks for each answer, and define the maximum duration for each question. The questions can be associated to a specific level of membership (defined by PaidMembershipPro plugin). The list of the topics and courses are related to the already defined categories of courses and courses in WPLMS theme. In the front-end, the user have to buy a membership level (defined by PaidMembershipPro plugin) to be able to create quizzes from questions. He then get the ability to create a custom quiz populating from the questions based on his level of mebership, while defining the maximum number of questions included, categories of questions selected randomly or by his choice, selecting their level of difficulty, whether he get immediate correct answer after each question or all results at the end of the quiz, whether or not to use a spaced repetition for the wrong answers with a specific algorithm depending on the passed time on the hole quiz and his level of confidence upon answering (defined by the user when answering each question). The user can modify in the front end the default algorithm used for the spaced repetition. Answers are saved in progress for the user, so when the user leave the screen or end his session and reconnect again, his answers are saved and he can go back to the question where he last left. The user get all results for each quiz stored and he can view a list of the reports in his member profile with Buddypress, and filter these results by score or pourcentage, view the results for each quiz, download them on PDF format. Users are ranked upon their scores, and user may choose to get included in the rank or not after fnishing the quiz.