Competitive Exam WordPress Plugin Development

I need a WordPress plugin that supports multiple types of exam formats: multiple-choice, true/false, and written response.

Essential Features:
Single Choice
Multiple Choice
“Sorting” Choice
“Free” Choice
“Matrix Sorting” Choice
Cloze function
Assessment
Time limit
Random Answer
Random Question
HTML in questions and answers is allowed
Multimedia in questions
Back-Button
Correct / incorrect response message for all questions
Different valency for every question
Different points for each answer
Result text with gradations
Preview-function
Statistics
Leaderboard
Quiz requirements
Hints
Custom fields
Import / Export function
E-mail notification
Category support
Quiz-summary
Many configuration options
Really nice standard design
Mighty
Fully compatible with cache plugins
Automated grading
Timer for each question
Progress tracking
Negative Marking
Fractional Marking
Clear Answer
Advanced Layout
Per Question Time
Bulk marks Assign
Student Dashboard
Question Upload from MS Word
Email Answer sheet to Student and Admin
Pre requisite with minimum % (user must have to finish previous quiz with minimum x % to attempt next quiz.)


User Roles:
- Functionality access for Administrators, Teachers/Examiners, and Students

Ideal Skills:
- Proficiency in WordPress plugin development
- Experience with exam/quiz functionalities
- Familiarity with user role management in WordPress
- Strong background in implementing automated grading systems

Please ensure the plugin is user-friendly and secure.