I attached a copy of my latest I-20, a copy of I-94 and original transcript.
Filing DSP-122 with KCC is not necessary for AOS, but it does not hurt to let KCC know that you are doing AOS. It's only a single form you have to fill out and send anyways.
Make sure that you send the $330 fee to the DOS ASAP. This is the first step, as it is necessary for you to send a copy of the receipt from DOS with your I-485 package. It will take 2-3 weeks to get the receipt back, so you need to do that ASAP.
isn't it $440, at least it's what KCC told me in an email. or does it depend on status?