YOU DID 4 tandems?
WOW!
Well for AFF (accelerated Free Fall) all you need is 3 tandems before you can start your coached jumps!
You were almost there!
http://www.affschool.com/8_levels.cfm
It's not difficult sport / hobby to learn.
It is just freaking expensive as all hell....and...to get good...you have to do lots of jumps...so...money....