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divisionbyzero
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Mohater's recommendation to keep an error log is important.

If you user pencil and paper, circle the questions that you have trouble them and revisit them religiously.

You can also create a free account on the Practice Pill and it will automatically keep an error log for you so you can see which questions you attempted and which ones you got wrong.

https://www.gmatpill.com/gmat-practice-test/

SC is the easiest section to improve. So just make sure you keep track of your mistakes and spot the patterns between them. That will help you to not make the same mistake in the future.
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Thanks for the suggestions.

mohater -- can I get some more information on the WHY aspect of problem review. For example, I missed PS 155 on the OG 13 guide: if y is the smallest possible integer such that 3150 multiplied by y is the square of an integer, then y must be:

(A) 2
(B) 5
(C) 6
(D) 7
(E) 14

I know how to break down a number into primes, and what it means to do so. But I did not know that you should break down 3150 into primes, look for primes that weren't in pairs, and multiply them to get the answer. After reviewing the problem I now know that when a number is squared it has pairs of primes.

What other knowledge should I be abstracting from reviewing this problem? How can I go deeper (insert inception picture)?

Thanks,
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divisionbyzero
Thanks for the suggestions.

mohater -- can I get some more information on the WHY aspect of problem review. For example, I missed PS 155 on the OG 13 guide: if y is the smallest possible integer such that 3150 multiplied by y is the square of an integer, then y must be:

(A) 2
(B) 5
(C) 6
(D) 7
(E) 14

I know how to break down a number into primes, and what it means to do so. But I did not know that you should break down 3150 into primes, look for primes that weren't in pairs, and multiply them to get the answer. After reviewing the problem I now know that when a number is squared it has pairs of primes.

What other knowledge should I be abstracting from reviewing this problem? How can I go deeper (insert inception picture)?

Thanks,

Not to answer for mohater but it seems like you got the gist of the problem. You now have a method of attacking the same kind of problem.
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What you're looking for is figuring out "what is the problem asking".

When presented with a problem where you're sure how to approach the problem, there's a good chance you don't know what the problem is asking for (what you need to solve for). The GMAT has many, many problems set up this way to stratify between test takers. Setting up the primes isn't the approach here, you need to set up the equation.

Read this thread for more details on this specific problem: need-help-thanks-91668.html
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