A habit is the tendency of an individual to behave in the same way as he has behaved earlier. 

It's the repetition of a similar action in similar circumstances. Habit may either be good or bad .

FORMATION OF HABITS : 

steps in habit formation are as follows : 

• ENTHUSIASTIC OR STRONG START  : A new habit forms quickly if strong motivation is present .
• VOLUNTARY REPETITION OF NEW WORK / HABIT : Voluntary repetition of a new habit helps to make it firm .
• ABSENCE OF EXCEPTION : Another important principle in the formation of habit is the absence or avoidance of any exception in the process of formation .
• ACQUAINTING WITH THE SITUATIONS WHICH WILL HELP IN HABIT DEVELOPMENT : Relate with the situations which will encourage habit formation and avoid situations that will not help in habit formation .
• PRACTICE THE NEW HABIT : Practice new habit until it becomes rountine . BREAKING OF HABITS :
• In order to remove a bad habit it must be replaced with a good habit.
• Start with a strong desire to change.
• Do not allow exceptions while practicing a good habit.
• Seek support from others for practicing the new good habit.
• Continuously practice the new habit.
• Some other rules for breaking bad habits are :
• Breaking of habit by voluntary practice, conscious repetition tends to give us a control over habits this facilitating their cessation at will.
• The formation of a contradictory habit to break it.
• Breaking of habit by doing it to excess.
• DEVELOPING GOOD STUDY HABITS : 
• Discipline your time .Make a written plan for your study and stick to it. Allow enough time for the subject especially if it is difficult for you.
• Begin your study period by reviewing something you already know quite well. Then move on to more difficult areas.
• Set up a suitable place for studying . Plan  it for neatness, comfortable seating and temperature without distractions.Some studying can be done with others.
• Begin to study immediately in the time you have set aside for this. Have pencil paper, books and everything you need before you begin.
• Refuse to allow other things to interfere with your study. Put your study time before recreation or socialization.
• Study only one subject or one part of a subject at a time. Focus your mind on this until you have mastered it. Relating it with other subjects  can be done later.
• Review your subject material, lecture notes and reading regularly. If you review at the end of the day, week or study unit you will remember important material and understand new material more easily.
• Relate materials from psychology to other subjects and in your daily life and work. When you learn how the body responds to fear, for example, you will understand your own responses and those of a new patient who may be afraid of his illness and the hospital.
• Learn to take good notes. Put the both lectures and textbook material into your own words as much as possible .
• Ask for help and explanation from your teacher when necessary.
• Take short break (five to ten minutes) to exercise or relax in some way.
• Record your assignments, plans for study and appointments in a small notebook.
• Plan one full day free of study each week