Hi Zunera,

Khan Academy is not an accredited institution; we're unable to provide learners with a teacher or coach. All of Khan Academy's courses are available for free, and able to be worked through at your own pace. 

You can add courses to your homepage by following the instructions listed here, though you can always access any of the courses from the drop-down menu on the top left corner of the page.

I hope this helps! Please let me know if you have any further questions.