teacher as parent

I don't feel right about my son, Jimmy , passing onto 7th grade  without expressing my frustration with the experience he had in 6th grade. While he loved his math and science teacher, and his grades were not terrible, I found the communication lacking, and my ability to help him on his homework or prepare for tests less than satisfactory. I went to a parent teacher conference at the beginning of the year with both of his teachers, and found the result unsatisfying, and not really worth the time spent. My primary frustration was with his Language Arts and Social Studies teacher. I can tell that she loves her subject, and has spent a number of years developing her curriculum, but with that in mind, I cannot understand why she doesn't have a syllabus. So many of her larger projects are/were assigned with short notice and no written explanation for a parent to guide or support their student.
I reached out to this teacher on a number of occasions and offered to help correct papers, or post grades, or anything to bring her up to date so I could get a handle on Jimmy's grades and determine whether he was keeping up with assignments. As it turned out Jimmy was behind on assignments and his teacher only accepted late work on certain things. In Jimmy's defense, I found that he had been told of large projects very late, or been given an assignment verbally as he was leaving class. This was confirmed by a number of parents of students and former students of this teacher. And this is why I am writing. It sounds as if this has been going on for some time. My son has survived the experience, barely, and I do not believe my talking to the teacher directly about any of these complaints would be any more effective than it has been in the past...so I just wanted to go on record.
I haven't even started with my frustrations about his PE teacher. I am dreading 7th grade for Jiimy. My older son Max was lucky enough to have a great, young enthused young woman as his language arts and social studies teacher; the flip side of that was the nightmare of having a staunch, hard line, non-accommodating or differentiating math teacher. I am afraid Jimmy will fail in this man's math class, but know he would thrive with the partner LA and Social studies teacher- these are my choices?! 
As a parent, who happens to be a credentialed teacher, I am more than willing to have a second text at home for my son to work from and to insure he is keeping up with his readings. But I need be informed what text, AND WHAT EDITION, they are using in class so I can get the correct text. Please insist that teachers post their assignments on school loop- and if there is a long term project to attach, the instructions. These kids are LEARNING how to get organized, but they are not there yet. As a committed, though over extended working parent of three children, I need all the help I can get from the teachers in order to help my son be a prepared student in their class- this is a partnership, not a blame game.