What should you do if you forgot your textbook but you have to study for your science test?

You could try and call a friend and see if they would come over and study with you, or possibly study over the phone. If a phone is not available or you are unable to use it for a long enough period of time try through Facebook or another online chat such as AIM or Yahoo instant messenger.

As a last result you could always call your teacher and let him/her know what happened. He/She may give you one day grace period to study for the test given the circumstances.

You should be studying for a test mainly from your notebook and homeworkassignments, not from reading the textbook! Re-reading the textbook is not an efficient way to study - use your notes because that way, you have the main information and you also know exactly what the teacher has stressed in class, which is what's going to be on that test.