我很累了！=（

开学了这个周（这周开学了）。我们的老师们（布置太多)给太多作业！我也打排球(后还要做作业))，我回家9点30和我还有作业。我很高兴是周末 =P

(Until my Mandarin gets better I will provide an English translation so people can correct my sentences easier)

School started this week. Our teachers give us too much homework. I also play volleyball, I return home at 9:30 PM and still have homework. I'm glad it is the weekend

我很太累了！=（

这周开学。我们的老师们给了太多作业！我也打排球，我回家9点30和并且我还有作业。我很高兴是周末 =P 

The "们" is not needed as Chinese do not care so much about the plural form. You will use "们" when you try to express "we", "they" or "you", and you can express them as "我们","他们","你们", and when you are giving a public lecture, you can say "女士们,先生们", whcih means "ladies and gentlemen".  I cannot remember other occassions we use "们".

我很累了！=（

开学了这个周。我们的老师们给太多作业！我也打排球，我回家9点30和我还有作业。我很高兴是周末 =P

Should be :这个周我开学了，我们的老师们给我布置了太多作业！我也打排球。我回家的时间是晚上9点30分，并且仍然要做作业。我高兴的是周末到了

Please compare my revised with your translation
(Until my Mandarin gets better I will provide an English translation so people can correct my sentences easier)

School started this week. Our teachers give us too much homework. I also play volleyball, I return home at 9:30 PM and still have homework. I'm glad it is the weekend

我很累了！=（

这周开学了。我们的老师们布置了太多作业！我也打排球，我9点30回家。我还有作业。我很高兴周末到了 =P

red:correction

blue:suggestion