What are the ways to measure the SEM efforts that are successful?

Following are the ways to measure the SEM efforts that are successful
#1: Quality Score. Quality Score is Google's measure of the relevance of your keywords, used to ensure that searchers see relevant ads and have a positive experience. ...
#2: Click-Through Rate. ...
#3: Conversion Rate. ...
#4: Cost Per Conversion. ...
#5: Wasted Spend. ...