This week is the seventh week of thise semester.

Avoid repetition of words. The seventh week already illustrates that it is a week therefore, the "week" in the beginning of the sentence is not needed. :-).

Except on the day before the Gold Week, w. We have six meetings the day before the weekends.

A full stop after Gold Week needs to be used as a new sentence has started. The day before weekends is Friday, however, I do not want to mislead your context and or idea by changing it.
But the correct term would be " We have six meetings on Friday".

I hate having meetings that are producing bullshitbullshit meetings so frequently.

I do not want to mislead your context. Therefore, I have made minor changes.

Especially the headmaster, she likeis talking a lotative, which is really bullshit.

The word talkative illustrates that she likes talking a lot.

The teacher of Class 4 said, "only if there aren't so many meetings, can you know that the leaders are good at speech leaders were good at communication, we wouldn't need to have so many meetings."

I had to completely rephrase the sentence. My apologies if I have gone out of context. :-)

There is a saying, "Wasting the someone's time is killing themthe subtlest form of murder."

I know this saying but I do not know whether to correct it. :-). I'll correct it anyways.

I caouldn't agree more.

Can't agree more just doesn't sound right hence why I used couldn't which sounds better.

This week is the seventh week of thise semester.

Except on the day before the Gold Week, we always have six meetings the day before the weekends.

I hate having meetings that are producing bullshitbullshit meetings so frequently.

Especially tThe headmaster, she especially likes talking a lot, which is rebut it's ally bullshit.

The teacher of Class 4 said, "onironically, if there aren't so many meetings, can you know that the leaders are good at speech administration were good at communication, we wouldn't have so many meetings."

Hard sentence to rewrite in English, 只有...才... just is not really that translatable in a situation like this.

There is a saying, "Wasting the someone's time is the same as killing them."

I caouldn't agree more.