If your students work on iPad, then the students can ask you for help with the Help Queue function.
When the student are asking for help, you will see a orange-red number at the top right corner over the person symbol.
If you click the number, you will se a list of students, when they asked for help and in which order. You can also see the problem they are struggling with. So if multiple students are stuck on the same problem, maybe you can do a break-out-session with them.
When you have helped a student, you click to tick the box next to the student's name. And then you can move on to the next one.