There is no tutorial to make a class attendance app. This article will help you set up the required database possibly if you want to store the attendance information on the device
We want you to have fun with App Inventor so here are some resources to help you learn to use the AI2 tools A very good way to learn App Inventor is to read the free Inventor's Manual here in the AI2 free online eBook
http://www.appinventor.org/book2 ... the links are at the bottom of the Web page. The book 'teaches' users how to program with AI2 blocks.
Does this help you program. Please continue to ask questions here however if you read the information above, you will not have to wait for answers.
Just try some blocks and have fun.