teachers can improve a student's self-esteem by

Answer 1

In reality, only students can improve their own self-esteem -- by studying hard and doing well.

False praise from someone else is futile.

Answer 2

Try Jigsaw Classroom:

http://www.google.com/search?client=safari&rls=en&q=jigsaw+classroom&ie=UTF-8&oe=UTF-8