Children's learning site in Wordpress with LMS for lessons and progress tracking

Please Read Carefully, quote as accurately as you can and when responding discuss only my job, do not send me pre-generated text responses - any responses not adhering to these things will be disregarded and any person contacted who then wildly jumps their quote will also not be taken forward. Thanks. i need a site that has functionality in a back end that stores lesson and student progress. It must link into my front end which is WordPress to get into the back-end via log on. I will provide more detail to the right developer. 1, The initial design will be similar to a site i have seen and will share with the right person, but in principle it is Wordpress with possible a few CSS and HTML changes to the template. 2, It has four simple pages, home, courses, about us and log on with links to different info 3, The log on page must when filled in to takes user into the Free third party LMS system that needs to be child friendly 8 - 16 years old)) that holds lessons and tracks student progress. 4,The LMS system is chosen by developer and agreed by me, but must be easy to use (not Moodle) FREE opensource where you can add our logo. 5, LMS must have student and teacher area, students area has lessons and shows them their progress, teacher area can add lessons keep track of student progress and award badges or certificates. 6, LMS has three categories with sub-categories under each and subsets under those. 7, The whole thing should come together seamlessly and require nothing from me to make it work 8, We will provide all content, images etc for Wordpress site and LMS 9, We will require a small user guide on how things work, particularly the LMS and username/password generator 10, we require the use of one time sign on generated username and password where once logged off the username and password no longer function. 11, the design must be clean, modern, child friendly , easily accessible and responsive so it works on all devices, this includes logging into the LMS, very important as classes are run on tablets. 12 If we find the right developer we will use this person for the next job which is to build an LMS system directly related to us only and is a web app