Hi shahzaib,

The AP Chemistry beta course is actively being worked on right now to eventually replace the older AP Chemistry course. Newer material and practices covering the first seven units of AP Chemistry are available in the AP Chemistry beta course. This article can provide you with more information about the AP Chemistry beta course: https://support.khanacademy.org/hc/en-us/community/posts/360059875512-Content-Update-AP-Chemistry-beta

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