Add more features to existing wordpress plugin

This Project is For Experts ONLY ! (Fastest will be preferred) The Plugin I am taking about is Quizzin [login to view URL] Features I need to be added in this plugin are :- 1). As soon as the user submit the quiz,his all details should be stored like Number of attempt & unattempt questions, number of right & wrong attempts so that we can access individual performance. 2). Currently the plugin shows the question in the same order submitted/created by the admin, I want to show random questions every time any user starts the quiz should be differentiated by IP, username and time 4). Currently plugin has a timer which shows the remaining time for quiz to end & submits the quiz automatically, but it doesn't display time more than 1 hours. If I set time for 2 hours - it starts the timer at 59:59 min and after 60 min it again starts the remaining 60min . INSTEAD OF THAT it should display the time in hr:min:sec 5.) On quiz creation page add a field for deciding marks for each question and option for negative marking and again a field to decide how many marks have to be set at negative for every wrong answer. 6). At result page currently the plugin shows correct answers out of total question and also shows rating as : Passed, Failed, Average, Just Pass. But the new plugin should have more options including previous options like ->> Whether to display result just after submission of Quiz or not So, We can declare all results for every one at once inform the user about there ranking in all quizers it should be done automatically. 7). Make all quiz at default available for only members except when I select FOR EVERYONE options. It should be manageable while creating quiz. If You have any question let me know and in the bid you must include "Iagree", so I will know you reader the project needs compl