One of my favourite sentences here- so flippantly resigned!

Thanks for randomly requiring watashi here.

It's important to know that しり is used in the negative ます forms but not positive - instead in the latter it's the ています form because that describes the continuation of a state.

さあ、私は全然知りません。

The definitions of the word "know" provided here aren't relevant to the answer

It still does require watashi

In some sentences, using the right kanji results in the sentence being marked as wrong while in some others, the kanji is actually expected and the hiragana is marked wrong. It makes it difficult to find the expected answer and it has become some sort of random guessing game :( It would be super cool if both kanji and hiragana versions are accepted for all sentences after the course has graduated from its beta version.

You don't need the わたし here. In every other lesson this app doesn't used the watashi or anata and here it says you must have it which I know is not true com'on!

Hell hath frozen over. They actually used the subject "I".

I wrote さあ、せんせんわたしはしりません and it counted me wrong. I'm guessing it's because of the word order, but I don't know why. Does what I said translate any differently?

The English translation seems kind of strange.

Why wouldn't this be していません？ Wouldn't しりません be more like "I won't know it/I refuse to know it"?