ANUPAMA,
all of your question can be answered in the CIC website. You just need little of your time to be familiar on it. here is the link for the indiviudal selection factor points.
http://www.cic.gc.ca/english/immigrate/skilled/apply-factors.asp
Just also go to home for more info on that website also. Other member here can elaborate further if you have question like the senior member
Regards,
ben