Hello Ali Rida!

It's possibly that the MCAT prep course will be soon retired after September 30th, but for more infor, check this post of guide you: https://support.khanacademy.org/hc/en-us/community/posts/360072389492-Is-there-a-way-I-can-download-or-save-all-the-content-from-the-MCAT-prep-course-before-it-retires-on-September-30-2021- : Here you can find more information regarding your post!

-Hope this helps,

~Galaxy.