Try reading this over it might be of some help to you they are not official for credit classes but they have some good information and is easy to use.
http://www.cambridgeincolour.com/tutorials.htm
BASICS
* Cameras
* Understanding Digital Camera Sensors
* Understanding Camera Metering & Exposure
* Understanding Camera Lenses: Focal Length & Aperture
* Choosing a Camera Lens Filter: Polarizers, UV, ND & GND (NEW)
* Understanding Depth of Field
* Understanding Camera Autofocus (NEW)
* Understanding RAW Files: Why Should I Use RAW?
* Camera Lens Flare: What It Is and How to Reduce It
* Understanding the Hyperfocal Distance
* Imaging
* A Background on Color Perception
* Understanding Digital Pixels: PPI, Dithering and Print Size
* Understanding Bit Depth
* Understanding Image Types: JPEG & TIFF
* Understanding Histograms, Part 1: Tones & Contrast
* Understanding Histograms, Part 2: Luminance & Color
* Understanding Image Noise
* Understanding Sharpness
* Understanding White Balance
* Understanding Image Posterization
* Understanding Dynamic Range
* Understanding Digital Image Interpolation
TIPS & TECHNIQUES
* Using "Levels" in Photoshop
* Using "Curves" in Photoshop
* Sharpening Using an "Unsharp Mask"
* Using Local Contrast Enhancement
* Converting a Color Photo Into Black & White
* A Closer Look at Resizing an Image for the Web & Email
* Optimizing Digital Photo Enlargement
* Averaging Images to Reduce Noise
* A Flexible Depth of Field Calculator
* Color Management
* Color Management, Part 1: Concept & Overview
* Color Management, Part 2: Color Spaces
* Color Management, Part 3: Color Space Conversion
* Working Space Comparison: sRGB vs. Adobe RGB 1998
ADVANCED TOPICS
* Understanding Diffraction: Pixel Size, Aperture and Airy Disks
* Digital Camera Sensor Sizes: How Do These Influence Photography?
* Using the High Dynamic Range (HDR) Feature in Photoshop CS2/CS3
* Tilt/Shift Lenses: Using Shift Movements to Control Perspective (NEW)
* Tilt/Shift Lenses: Using Tilt Movements to Control Depth of Field (NEW)
* Intro and Common Obstacles in Night Photography
* Photo Stitching Digital Panoramas, Part 1: Overview & Capture
* Photo Stitching Digital Panoramas, Part 2: Using Stitching Software (NEW)
* Photo Stitching Digital Panoramas: Image Projections