is google adwords certification free

As a reminder, the passage of the certification is now free and valid for one year, which also means that it will be necessary to pass through the exam again each year in order not to lose this benefit. You must pass at least two exams from the list of 6 proposed (with a minimum of 80% success in the questions), the Adwords basics exam and then one of the remaining 5 to choose from.
Automated Adwords
Key Benefits
Optimized Google Ads results
Fully automated PPC campaign management
Automate PPC campaign Creation
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Some Statistics

30.89 % : percentage of mobile Google searches that return minimum one ad on page 1.

Advertisers use up to 51 % of their budget on mobile ads.

The standarnd conversion rate in Google Ads over industries is 3.75 % for search.