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You can send additional letters as supplemental information if you would like -- there's no limit on the number or type of supplemental information you can send, and many people send an extra letter as a supplement.
You could absolutely send the letter as one of your two recommendation letters, but it may be better to send two letters that address all the points MIT requests, and send your pre-written letter as a supplement. It's up to you.
As for your grades, MIT is familiar with a wide range of international school systems. Your transcripts won't pose a problem.
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