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which book should i buy for difficult puzzle question?

I am weak in quant so please tell me what I should do

I am weak in quant so please tell me what I should do

technique of simplificat
ion

sir can u provide any speed test in hindi for quant or reasoning sctn...

IAM WEAK IN QAUNTITATIVE APTITUDE  PLEASE HELP ME

In a question asking for the maximum numbers of identical cubes that can be obtained by cutting a larger cube 61 times, the answer was derived by taking the cube to be cut 20 times along 2 of the 3 axes, and 21 times along the third axes(total 61 cuts). But I am not able to understand how can a cube be cut unequal number of times along different axes to get the max number of resultant identical cubes. I can make out 20*20*20 cuts along the 3 different axes, but how does the 21st cut result in final set of identical cubes? 

In app can you give option for 'show correct answer and solution' like how it is in website. I am asking like this so that we can practice while going through attempted papers.

give tips for english i am not gaining good marks in it

Please give me some shortcuts to solve para jumbles in reasoning!