Solution:

Webex Training doesn't have a built in feature to have a post session survey. 

As a workaround, you can use a 3rd party solution such as Survey Monkey, then add the survey URL as a Destination address (URL).

While scheduling a training session, you can specify a destination Web page or Web site that attendees view automatically after the training session ends.

Follow the steps below to specify a destination URL:

1. On the Schedule Training page or Edit Scheduled Training Session page, scroll to Session Options.
2. Type a destination Web site address (URL) in the Destination address (URL) after session box.
3. Click Schedule or Update.