Hello there,

Thank you for your question - at the moment, Khan Academy only provides two practice tests for each one of the sections: Math, Reading, and Writing.

Now, if you'd really like to redo your practice tests, you can always create a new account. Just note that badges, points, and your streak would not transfer from one account to another since there’s no way to merge accounts or share progress between them.

I hope this helps but please let me know if you need any further assistance!