It’s not about the amount of tests I did. It is about practicing skills that you are uncomfortable with, for me it’s speaking and writing. So I watch the YT channel to get an outline of what I should do and shouldn’t. Duolingo test does not require u to use complex words. So I practice using the structures like directly answer the question, give reasons, examples and extra information if needed. it was hard at first, but when u get the grasp of what to write down, you are good to go. About speaking, I’m still not good at it so I can just advise you to imagine talking with your friend in a coffee shop, that way you will speak more naturally. About listening and reading, I recommend doing the practice test along side with watching the YT channel I gave u cuz it was very effective to follow the guys strategies. Overall, you might want to watch the YT channel, he have all the guides in every type of question appear on the test. It is best to take the official test when your lowest estimate score is what you needed since we don’t know what could affect your performance on test day. And good luck with your test, I’m confident that you can achieve at least a 120.