Is this sentence suppose to be in past or present tense? Please help!!!?

I need to fix these sentences but I need to know which tense i should switch to, can you please help me?
Ms. Tez stay up late when she wrote a study guide for us to used. She knew it is a bad idea to stayed up all night, but she also knows that if she forgot to do her homework she will get fires from her job.
 
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