Web development

I need a new website. I need you to design and build it. I am looking for Online Test Sytem build in python and for database i would prefer firebase. Questions type include Quizzes with negative marking, true false, Fill in the blanks, Matrix type questions, Passage type questions. Dashboard design should be bootstrap based and should be fully responsive. I want integration of payment gateway & email via smtp. Users will be classified into Admin, Teacher & students. students will be categoried into groups and each group will have access to specific exams. Exams should be divided into categories & there will main two categories. Questions will be uploaded in question bank which will be further divided into categories & sub categories. Admin can manually add users from dashboard. Teacher can only add new exams & monitor or finalise results. When creating exam it should specify Duration of exam, Date, marking & negative marking of questions, Number of attempts allowed, shuffling of options in multiple choice questions, Assign Groups, results to show immediately after finishing exam or after finalisation by admin/teacher and add questions. Dashboard of admin/ will show statistics like total users, live users, Total active exams, Total questions attempted , stats of recent exam. Student dashboard will shows stats like total no. of test attempted, average accuracy in test, proficiency, Total questions attempted. Leaderboard where students will get ranking of the test. Student will get recommendation based on performance on the previous exams. It should have mathjax/mathml/latex support and questions import/export via excel. I also need encryption of questions when the user takes the quizz. Android app design should also undertaken.