What are the key elements to optimize the conversion rates per PPC?

Conversion rates are calculated by simply taking the number of conversions and dividing that by the number of total ad interactions that can be tracked to a conversion during the same time period. For example, if you had 50 conversions from 1,000 interactions, your conversion rate would be 5%, since 50 ÷ 1,000 = 5%

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Quality score, Landing page quality, relevant high search volume keywords, Ad Groups and Ad copies are the primary factor to increase conversion rate through Google Adwords.

Know Your Market. ...
Strategize Accordingly. ...
Know and Understand Your Traffic Sources. ...
Develop an Appropriate Call to Action Mechanism. ...
Set Realistic Targets And Know When To Convert Your Prospects. ...
Shout About Your Strong Points.