Fixing a Custom PHP Wordpress Quiz Platform

I have a quiz platform that was created for a client that isn't working any more the way it should. Its a custom web platform that allows for creating custom quizzes and testes but which has a bunch of flaws. What I need is to fix those flaws that the customer can again: - Create custom quizzes and change questions the way it was intended to - Permit that a user get 70% of questions right before being allowed to proceed to another quizz/test. - Needs to capture e-mail and send the results to admin email. - Signup for the access the quiz is broken and needs to be simplified to only 3 fields (Name, Email, Telefone Number) - Admin should be able to determine which quiz the user should or not see based on level/attribution. Suggested Improvements: - Create a CRM Style Reporting structure for admin to see the results of each user based on quizz/test they completed + date of completion + results on the test in a centralized area/page. - Should load a quizz only with questions the user got WRONG. - Admin should be able to segment content based on attribution. - Users should be able to see their progress visually based on tests taken/results etc. I will give you access to the test platform and FTP so that you can analyze the code on a 1 to 1 basis based on who I select for this job. I will then switch the password to the FTP so that the next person can evaluate whether or not the job can be completed before giving me a quote. This is for the security of my client and I assured that I would do it this way. Thanks and hope to work with you!