I took the exam in May (dentist), just got the results today (posted on the OET website), i screwed up the writing test (D), this was really surprising, i was expecting to have bad results for the speaking but it turned out just fine (B) and I got A for reading and listening. Bottom line, i have to take all 4 subtests all over again in september

Anyone has similar results ? i have no idea about what i did wrong, the task was to write a referral letter and it seemed very simple (obviously it was not).
Anyway, if anyone could give some hints for the writing test, that would be greatly appreciated.
Thank you.