When you've successfully completed your eDrive training with a score of at least 80% you'll unlock your eDrive certificate. This is first available for you to download from the final course completion screen. Just click on the "Download certificate" button to get your PDF eDrive certificate.
The certificate is also available for you to download at anytime from your eDrive user dashboard. Simply log back in at any time (while your account is active) and you'll see a "Download certificate" button on the dashboard (provided you've completed the course with the minimum 80% score).
If you'd like to improve your score then you can click the "Retry Your eDrive Course" button to go back and retry those questions you previously failed. If you do improve your score you can download your certificate again to reflect your new result.