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Syllogism doubts

What are the things to be taken care of to increase my present percentile 89.4 to 99+

There are 8 speakers A,B,C,D,E,F,G and H in a conference. A,B and C always speak in alphabetical order. The probability that A,B and C are the first 3 speakers is a/b, where 'a' and 'b' are co-prime, find a+b.
This is one among the qstns I found in your video series for probability. I really didn't understand how the total no of outcomes became (8!/6), why can't we take A,B,C as one unit and consider the total no of outcomes to be 6! ?

In eliminating two closer options,i'm facing a severe difficulty in Reading comprehension. i always end up with negative one.in rare case,i'm going for right.how can i approach to this problem ?

How to prepare DI?

How can I solve  questions of functions nd maxima nd minima faster? 

I am not able to understand probability and permutation , combination

Kya ye mock test Hindi me Ni ho skte ??

What does the mocks cost only cat ones