^Is there stuff missing from the end here? I feel like the last part of your story needs some work, but I'm not sure if it just got cut off or something.
In general, you've got some interesting ideas here, and some nice, subtle language within your story. But there were a few moments where the plot got a bit confusing. Maybe it was just a word choice issue, but some of the descriptions didn't really make sense.
Also, there's this rule in creative writing that says you should 'show' your ideas instead of 'tell' them.
So, for instance, this sentence: "I was anxious about Vanessa’s future" is very 'tell-ish' because it's like the character is explaining stuff to the audience. Instead of just having them say 'I'm anxious,' try and show that anxiety through your story. Maybe have her nervously go about her chores (e.g. she tries to cook dinner but keeps slipping up and cutting her fingers or banging her head on a cabinet
)
Think about how awful a movie would be if something bad happened and the character just said 'this makes me sad.'
But they don't do that - they cry, they collapse to the ground, they put on sad facial expressions <-- that's the kind of stuff you need to include if you want to 'show' emotions.
Similarly, for sentences like "repeatedly reminds me of my financial issues affecting my daughters’ lives" - how does the character feel about this? There's a lot more to say about these ideas, and it'd be really impressive if you could 'show' them as you go.
Let me know if you need clarification with any of this 
Thank you lauren. I changed my piece according to your feedback. Can you please have a look at it now?
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I could understand Vanessa was disappointed with her score, after all, I had been nagging her to perform well, academically. An ATAR of 88.8? Is it enough to get her into the degree, I want her to study? I don’t want her to end up like me, financially disadvantaged, who can hardly fulfil her daughter’s slightest wishes. The thoughts suddenly took over me, as I tried to understand the vague situation. It all felt like a dream. Was it all real?
“Mum?” uttered Vanessa as stared me with an anxious look, believing that I would be disgruntled at her effort.
I had a fixed smile on my face for a moment, stuck in a conundrum about whether I should be dejected or happy with Vanessa’s achievement. I knew I would not be able to have a conversation with Vanessa for a while, until she really forgives herself, and it will take her time to recover from the HSC trauma.
“Vanessa. We will talk later. You must be tired, you should take a nap now.”
“Yeah mum, I really need the rest”, responded Vanessa with a melancholic tone, as she rushed into her room, forcefully slamming the door against the wall.
I stood there alone, trying to encourage myself that Vanessa would still be able to have a bright future.
***
It was raining outside. The thunder boomed like the clash of armour against a sword, when the lightning pierced the black-silk clouds. The blustery weather seems to echo the turmoil in our lives. The anxiety within me was interrupting me from thinking clearly. I was worried about Vanessa. Worried about her future. Will she ever succeed in this harsh world? Will an ATAR of 88.8 get her into a science degree; where she can have a chance of getting into a high-paid salary career? Many questions were popping into my brain, and I wasn’t able to answer single one of them. I was repeatedly trying to reassure myself that it will be all fine, as more pessimistic questions continued to pop up in my mind. The more I tried to think about Vanessa, the more I thought about my failures; which affected my daughter’s life. I have already suffered from my past failures, which had been a subtle reminder of my daughter’s destiny.
The questions left me pensive for a moment, as suddenly, the bell rang. I quickly stood up from the couch, and rushed towards the front door, as the bell rang again.
“Coming. Coming”.
As soon as I opened the door, the sun shone brightly, and the skies had dawned a clear, blazing blue. The birds were chirping, and the trees were sparkling with raindrops on the tips of their leaves. Everything seemed so calm and beautiful like a new day, a new beginning. As I was gazing at the suburban landscape, I saw Yee Mah. She stood at the porch with a massive smile at her face.
“Why didn’t you come earlier? I had been ringing the bell for ten minutes now,” utters Yee Mah, as she quickly stepped into the house. She rushed into the lounge room, as she plonked on the couch.
“I was just on my way, as…..”
“Alright forget that. Where’s Vanessa. How did she go with her ATAR. Did she do well?” panted Yee Mah excitedly as she meddled around with a glass ball.
I didn’t know what to say at this point. I was stuck at another conundrum. Should I lie to my own sister about Vanessa’s ATAR, or should I tell her the truth? I didn’t want anyone to mock Vanessa about her ATAR. I wasn’t sure that whether I should tell Yee Mah, but then again, Yee Mah is my sister, she might understand my feelings, and how I might be going through at this stage.
“She got 88.8. I am really worried about Vanessa. Do you think she will ever be able to succeed?” I quickly rattled off the words across to Yee Mah, as she stood there with a confused look at her face.
“ATAR of 88.8? That is so amazing! I don’t why you are worried about Vanessa,” responded Yee Mah.
I am not finishedThanks