To confirm what Labs you have completed you need only locate the Skills Lab Certification Center and you will be able to see what Labs you have finished. 
To check the Skills Lab proof progress, kindly go to Courses. To do this, click the 3 horizontal lines on the upper left corner of the Access page and hit Courses.

From here,  double click on the course title "Become a Health Coach".

You will then be directed to the Course Overview page. Look for the Become a Health Coach - Certificate Progress Center - Skills Lab as seen below.

A green check mark and a score of 100 indicates the Lab is complete, you can also see how long it took you to do the Lab quiz itself.

Remember, you only need to complete 50% (13 of out of 25 Skills Labs) for certification.