Errors:  

- regarding the school teachers

Corrected version:

There is little room for doubt that in the contemporary world students have disruptive, violent, and disrespectful demeanour regarding school teachers.

Improved version:

It is unequivocal that in today's society, students frequently exhibit disruptive, violent, and disrespectful behaviour towards their educators.

Errors:  

- on the society

Corrected version:

However, it has detrimental effects on society and the youngsters, as listed below.

Improved version:

Nonetheless, such conduct detrimentally affects both society and young individuals, as outlined below.

Errors:  

- students behaviour problem

Corrected version:

Possibly the most prominent cause of students' behavioural problems is the lack of their parental guidance.

Improved version:

The predominant cause of students' behavioural issues is likely to be the deficiency of parental guidance.

Errors:  

- Most of the parents

- busy in  

- activities,

- adolescents life

Corrected version:

Most parents are busy with their economic and domestic activities; therefore, they do not take an active part in their adolescents' lives.

Improved version:

A majority of parents are preoccupied with their economic and domestic responsibilities, consequently failing to engage actively in their adolescents' lives.