Modifications to website

The following changes are needed: 1) I need to track the usage of the web-site. Users are required to login with their email IDs. The change required should store the history of who has logged in, which pages were visited and how long the user spent on each page. 2) The payment method needs to be changed. Users currently pay a single fee for the whole month. I want to change this so that we can offer individual subjects as well - the fee for each subject should be set by us. This will allow users to select just one or two subjects, if they wish to do so. 3) We need to be able to allocate students to a particular session for a subject. We expect to offer more than one class per subject per week - we need to balance the class sizes. Once allocated to a class, a student cannot attend another class for that topic that week, unless they request to do so - we should be able to allocate a student to another class if required to do so. If they are allocated to a class (e.g) on Monday for Maths, they will be expected to attend that class only. Please ensure that this work is completed and fully tested in a development environment before uploading to the live environment.