HI Edgar, I know you emailed me, but I wanted to also respond here in case anyone else sees this.
Anyone can jump in late on my study groups, though it's a fair amount of work.
I am also offering a special exam cram this Saturday and next for those that didn't want to do the full study group.
If anyone is considering the September exam, they should not sign up for either of these, but instead wait for my September group. I've had enough requests about it, I'll likely open registration on it shortly. The full Sept. 2018 study group will start in June.