What study habits are helpful and effective to you?Give some

Start studying when planned.
You may delay starting your studying because you don't like an assignment or think it is too hard.A delay in studying is called "procrastination." If you procrastinate for any reason,you will find it difficult to get everything done when you need to.You may rush to make up the time you wasted getting started,resulting in careless work and errors.
Work on the assignment they find most difficult first.
Your most difficult assignment will require the most effort.Start with your most difficult assignment since this is when you have the most mental energy.
Review their notes before beginning an assignment.
Reviewing your notes can help you make sure you are doing an assignment correctly.Also,your notes may include information that will help you complete an assignment.
Tell their friends not to call them during their study times.
Two study problems can occur if your friends call you during your study times.First,your work is interrupted.It is not that easy to get back to what you were doing.Second,your friends may talk about things that will distract you from what you need to do.Here's a simple idea - turn off your cell phone during your study times.
Call another student when they have difficulty with an assignment.
This is a case where "two heads may be better than one."
Review their schoolwork over the weekend.
Yes,weekends should be fun time.But there is also time to do some review.This will help you be ready to go on Monday morning when another school week begins.