Another question is how to see that the students will get interested. Some teachers will teach in such a way that the students will get interested in the subject. This is possible only when the student is in his/her primary classes only. Once he grows he will make up his mind and have his likes and dislikes. Here the role of the parents also is very important. They should observe their kid very carefully and see that he will develop an interest in all the good aspects of life.
The way in which the teacher teaches also will make the student develop an interest in the subject he teaches.
Knowledge is power.