WordPress Plugin Modification

Hello, If you understand about Wordpress and modify its plugins, you're welcome to bid for this job. What I need is simple, I only need to modify an existing plugin called WP Survey And Quiz Tool (Please visit: [login to view URL]), you can try to instal that plugin to know the existing features. I plan to make these changes: 1. Special login page + self back-end admin interface that only shows the menus from this plugin. What I mean, I don't want the users to be confused looking at all of the Wordpress menus. 2. A feature called 'Subject' that allows user to upload the questions. For example, I want to create Subject: Math. Later, when I want to create Quiz, in the Section part, I only need to choose which subject that will be used and the number of questions. Only 1 subject for 1 section. 3. Upload questions. Currently, we have to insert the questions one by one, but I want the users to be able to upload it using certain Excel format. 4. Questions using JPG. You can see the Polling part. I want to be able to upload questions with picture & text in it. For example, I want to put the graphic and the text as the question. But, using the image is optional. Related to #3, users should be able to add the picture (edit questions) from their back-end interface easily. 5. At the end of quiz, when the result is being shown, I want to display certain messages that might consists of text and/or hyperlink. 6. PDF Sertificate: I want to be able using my PDF format. The existing one using blank page. I want to put the logo. 7. Several report formats that are generated from the visitors' data, such as the number of daily users. Please only bid this job if you understand the Wordpress, WP Plugins, PHP, and MySQL very well. Keep in mind rhat I won't pay you unless you deliver the program that I want. Regards, Andrew