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Biology; Chemistry; Physics: Post your doubts here!

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I wanted to ask that if I give all my sciences subject in may 2020 or 2 subjects in oct 2018 and the others in may 2019, then will this action effect my olevel result in one way or another?
 
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Guys, in chem today, that ammonium chloride wala MCQ what was the correct option? 1,2 and 3? Because it was written in teh question : why does it form in the position shown?
 
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also, if my answer to the moles question was incorrect, will i get atleast 1 mark for the working? And like if 2 marks are deducted it wont matter right?
 
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Aaaah. I have like 2 days now to prep for P12 and 22 - and I'm no where near good. :|

Kher, suggest me stuff to do. So far I've just finished the book and tried a couple of MCQs.
 
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Aaaah. I have like 2 days now to prep for P12 and 22 - and I'm no where near good. :|

Kher, suggest me stuff to do. So far I've just finished the book and tried a couple of MCQs.
Talking about Physics, 5054. I know I should've prepared more timely... Lekin could not... due to some unforeseen circumstances.
 
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Can anyone pls answer this question?
What are the problems in the systemic and pulmonary circulation if there is a hole in the heart?
 
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