Dear Temesgen, 

Some suggestions:

Article Stress, coping and quality of life: An exploratory study of ...

Article Emotional and psychological well-being in children: the deve...

Article Factors of Psychological Well – being and Models of ideal an...

Article Development of a Psychological Well-Being Inventory of Adolescents

I suggest you KIDSCREEN. You can find references on "Measuring Health-Related Quality of Life in Adolescents by Subgroups of Students and Outpatient Mental Health Clients"

http://www.scirp.org/journal/PaperInformation.aspx?PaperID=56895

You could try Strength and Difficulties Questionnaires. It is a standardized measure for children in school environments and assess socialization, antisocial behavior, self esteem, self image...

Are you looking for a measure of psychological psychological wellbeing or problems in psychological wellbeing. All of the above relate to screening for problems.

If this IS what you are looking for, the Strengths and Difficulties Questionnaire (see above) has the advantage that it is FREE, has been validated in many countries (but the total problems score is more robust than the subscales for cross-cultural use), has been translated into a wide range of languages, is available in parent-report, teacher-report and self-report formats, and includes a measure of positive adaptation (prosocial behaviour). I have attached the link to the website

http://www.sdqinfo.com/

Stirling well being scale is 7-12 years of age

Liddle, I., & Carter, G. F. A. (2015). Emotional and psychological well-being in children: The development and validation of the Stirling Children’s Well-being Scale. Educational Psychology in Practice, 31(2), 174–185. doi:10.1080/02667363.2015.1008409