Quiz and test application

Descripción del proyecto HI we are looking for someone who can make quiz webpage that has a database of questions from various categories, format is only text questions. Like a simple and easy exam application. categories, questions and answers are set at the admin, he can add delete or modify them User can define the category of the questions she will try, number of questions and difficulty level (between easy and challenge), questions and answer choices must be randomized on the exam. After each answer system will show the correct answer or at the end of the test, we would like to have both alternatives, once finished the result can be sent to the user by mail and it can be dispayed on the screen When showing the correct anser we would like tro provide a short explanation why this is the correct one Users will need to pay before getting access to the application. We would like to have a paypal buttom accept the payment and give inmediately access to the user and if you know other kind of method of payment can be used. Admin will have the chance to provide login passwords to users without payment Application wil be available to users just for a limited time, so Admin will block or delete previous passwords after n days. If you have already a webpage with some kind of the request we need, we can look at it and find if we can use it. you are bidding for a web page but android and IOS functionality will be welcome Best regards