How did you determine what you already know?

[dfrecore]

There are tons of courses/exams that you can take, you just need to look at all of them. See which ones sound like things you could fairly easily pass without a lot of work. Sounds like computer-related courses to me.

Saylor has a bunch, all for $25 per exam (course is free):
CS101: Introduction to Computer Science I
CS102: Introduction to Computer Science II
BUS206: Management Information Systems
BUS303: Strategic Information Technology
CS301: Software Engineering
CS402: Computer Communications and Networks

Coopersmith has some (SecularCourses.com) for $150/exam:
Computer Information Systems
Dynamic Web Design & Development
Intro to Computing & Program Design
Intro to HTML5 and CSS3
Multimedia and the Web

These are just examples, there are tons more out there, and in all different subjects. But if you go through the beginner's Guide, and look at what's offered by each course/exam provider, you will start to see what's available.