Your story was nicely structured and balanced but would have benefited from more story and character development. We need to feel the hook. We need to understand the importance of the exam and what the consequences would be if either failed it. We need to feel invested in the success of your characters in order to have empathy for them. Your piece also needs some editing and correction of punctuation eg:

"I forgot everything I am meant to use to write this exam at home," she said, dropping her bag and putting her hands on her head.

As this sentence stands, it is saying that she forgot the materials and that the exam would be written at home. It need an edit using Grammarly and/or Google Docs to punctuate it properly so that it is clear that it is her writing materials that are at home, and not the exam. This can be achieved by the following:

"I forgot everything at home that I am meant to use to write this exam,"...

You can find a wide range of article in The Ink Well that can help you to improve your craft. I would suggest working through each of them and focusing on practising the lessons that you learn through them when you next write in the community. See Catalogue of Fiction Writing Tips

Thank you for sharing a story from your life with The Ink Well.