First, let me welcome you to the site and thank you for your introduction. Hopefully, we can help you find some answers.
I'm not familiar with the ElementK system. I know they've been recently purchased by SkillSoft and neither company raises any flags with the CertGuard database, so I have to assume their content is legitimate.
There are a few steps that I would recommend to get started. I have them outlined on the main site in an article called CompTIA A+ Overview
and I've provided links in the article to additional resources.
If you haven't already, make sure you download a copy of the exam objectives. These will provide you with a summary of the specific topics addressed on the exams. There are two exams required for the A+, but for now, I would focus on the 220-701.
You will also need some form of text. The material you received along with your program may be sufficient, a couple that I like are the Exam Cram Fifth Edition and Mike Meyers' All-In-One Seventh Edition. The Meyers' book didn't have much coverage for Windows 7 but does include Vista. Seems they got to the publisher a little early. Good coverage of the exam except for that.
Regardless of the text you chose, be certain it addresses the current version of the exams (220-701 & 220-702). There's a lot of outdated material available that really won't help you much for the current exam.
We have additional resources listed in the main site as well as the Wiki. Take a little time to browse a bit, and if you have any questions, feel free to come back to the forums and ask away. We're still a new site, but we're always willing to help.