Thanks Poison and Pooja.
But in Guide EG7,Page No 7, it has mentioned as 22 points as below.
http://www.cic.gc.ca/english/pdf/kits/guides/EG7.pdf
A three-year diploma, trade certificate or apprenticeship AND at least 15 years of full-time or full-time equivalent study 22
Bcaz adding this 22...