No matter how cordial (or not) your discussions are with school officials, it's always a good idea to create a paper trail. Make copies of all correspondence and record the details of every meeting and phone conversation (dates, times, what was discussed, who was present, and so on). Put everything in a three-ring binder, along with report cards, test scores, doctor's evaluations, every note sent home by the teacher, and copies of your responses.
Good documentation can do more than jog your memory. It can act as evidence if you must seek legal help to persuade the school to meet your child's academic needs.