In the past I have often struggled with students who do not complete the assessment while others complete it. I have found that creating a video cast of the next day's lesson ensures that learning can continue. If students don't get done with the test during the class time, the instruction is available online. If students are done with the test, they get individual instruction so that their learning can continue.
Important:
The video needs to be less than 10 minutes long.
Don't complete ALL problems.
Require students to STOP the video often and complete problems.
