Originally Posted by Ben leis
its a lot of work getting a classroom going and understanding 20+ odd new students so you have to allow some time for that process to occur before you're likely to get much traction on something new you're springing on them.
Agreed. Some schools may ask for 6 weeks or so to become familiar with students prior to meeting with parents.

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If you do continue with letter I'd add a nod to that like "I know that the beginning of school is an extremely busy time for teachers but ..."
...or "I know that the beginning of school is an extremely busy time for teachers and I'm willing to assist with..."

Some may say that Ben's letter is more kind as it communicates empathy or perspective-taking for the teacher's likely viewpoint. Meanwhile the original letter may be seen by some as enthusiastic (generally a positive) or emotional (often a negative).