There is no advanced mathematics in the curriculum, which can be solved by the following methods: first, completely uninstall the learning pass, then reinstall it and log in to the learning account again. Second, click "My", then click "Settings", and then click "Contact us" to contact the official technicians and communicate with them to solve the problem. Thank you for your trust. The above is my reply. I hope I can help you and wish you a happy life ~