Yes, Richa, LOL....I get the drift. LOL
Referring to the official application guide, and this applies ONLY TO THE PRINCIPAL APPLICANT (adaptability points for spouse/education are separate):
A three-year diploma, trade certificate or apprenticeship AND at least 15 years of full-time or full-time equivalent study 22 points
A university degree of two years or more at the Bachelor’s level, AND at least 14 years of full-time or full-time equivalent study 20 points
The TOTAL number of years of education is "at least 14 years", which includes basic education and at least a two year university education to complete the Bachelor's degree. As you only have the one Bachelor degree you can only get 20 points. If, instead of doing a BCom, you had taken a Nursing programme (for example) you would have a three year diploma + 12 years of basic education and score 22 points. It isn't just the number of education years that give the points, but what degree/diploma/certificate you earned as well. Hope things are getting clearer.