You went to college 8 years ago and got some credits you forgot how many how can check if they are still valid?

To find out what courses you took, you can find them on a transcript. You can call the college and find out what you need to do to get the a transcript. Then you can send your money and get a copy of your transcript. That will give you a list of the classes you took. The credits may or may not still be valid. You will need to ask whatever institute you wish to attend what credits they will accept.