What are ways to get college credits fast?

Many courses through Defense Acquisition University (DAU) will grant undergraduate credits. AMU accepts some of those credits towards a degree. Same as other military friendly universities.
Perhaps something for you to consider. Courses through DAU costs nothing. http://www.dau.mil/default.aspx As PO1 Thomas Jenkins mentioned, consider your career/educational goal.

The only way to really acquire credits other than actually going to college, is to request a copy of your JST or Joint Service Transcript be sent to your college of choice. Depending on your MOS and the schooling (i.e. NCOES, AIT, specialty schools) you have been through will depend on the amount of credits transferred. This also depends if you want to go into the same career field that you are actively doing in the Army.

As you get further into your career and get more experience (this only applies if you are in relatively the same field as you MOS) you can be moved into a Bachelors of Applied Science degree plan. This is saying that you have experience and can get exempt from certain classes.

SPC (Join to see) I was the 1st to challenged Spanish at my college, BYU sent the test and my college proctored it,it was a 4 hour test and when I completed it, the test got sent back to BYU for scoring. about two weeks later I received a letter form BYU stating that I have 12 credits for passing the test and it is up to my institution to transfer them in. I went to my registrar's office showed them the letter and they gave me 16 credits, I was under the VA's Ch31 program, and went to summer school to try to finish quicker, and received my BS in MIS w/a minor in business, and became a qualified Mediator. work hard to acheve your goals in steps, soon you will learn that it is better to work smarter than harder, and save all your work as some of it can be used for other classes. ALWAYS SAVE YOUR WORK AND MAKE BACKUPS, I have seen places that give collage credits for life experience but they are not accredited, also check into ACES for transfers of military experience to collage credits.

CLEP and DANTES

Some schools offer life credits as well you can test out of some credits - however they're more quick than easy. For my MBA I tested out of business calculus class as I already had taken multivariable calculus it was rather easy. The life credits in most cases require a paper.

http://www.collegetransfer.net/Home/Change.Switch.Transfer/I-want-to/EarnMyCollegeDegree/TestingOutofCollegeCourses/tabid/916/Default.aspx

I used the DSST and CLEP testing that is offered at our education centers on post. I earned my Bachelors degree from Grantham University. Quite a few of these tests were either in my degree plan or I was able to use them as electives towards my degree.

I would definitely recommend studying for them though! The Army pays for your first test, but if you fail them, you have to wait six months before retesting and you would have to pay for the second test.

This is just a option that can help you complete your degree faster than the average student. Good luck.

Congrats on maxing out in military education, not an easy task for most young soldiers. When I was in most would rather have fun, party or spend their money and it didn't take them long either. (No, they wasn't that great at it, its an easy thing to do, just like today)
The way its written you could be setting yourself up for failure and that's something none of us want to see, trust me! I do not need to know you, as a retired NCO I can tell you no real leader in the military (no matter what branch thier in) wants to see our younger members fail or get harmed in any way shape or form.
You need to be making plans to better yourself for after the military dream also, so your not lost and its to late at a later date? The "Short and Long Term Goals/Plan" just like any military mission, you owe it to yourself to take advantage of the service as they will you and its one thing I see a lot of the others are trying to let you know.

It's been some time now from when I was in your shoes, but are you max on weapons, and PT score? They are easy points, education is something you want to take seriously so it something that betters you now as well as your long range plan.
Please be smart about this step so we can all be proud of the great things you are doing, will be doing as well as have done when your time is finished in the small percentage of Americans that served in the military. "Look at what they are saying"!