URGENT : guidance for practice tests

Hi, Here, I need help from experts and BTGians regarding practice tests/some test series. I feel I have gone through sufficient(if not exhaustive) study material and completed one iteration of OG questions(with some problems and mistakes still remaining!). Now, I wan to dedicate next one month to pr...

2^(x+2)-3(2^(x-1))=(5/8)(2^(16-x))
4*2^x-(3/2)*2^x=(5/2^3)((2^16)/2^x)
let 2^x=m
4*m-(3/2)*m=(5*(2^13))/m
(5/2)*m=(5*(2^13))/m
m/2=(2^13)/m
m^2=2^14

replacing m=2^x
2^(2x)=2^14
2x=14
x=7

this can be easily understood as:
1.take any two prime nos. say 2, 3
then G.C.D - 1
2. take x=2;y=6
G.C.D.- 2=x
3.similarly G.C.D y
4.take x=6;y=4
G.C.D.=2(x-y)
so,G.C.D. can't be x+y
or likewise you can understand as G.C.D. is the highest COMMON factors b/w two nos. so their sum can't be so

assumption CR questions

I am not able to grasp the logic to crack assumption based CR questions after going through PowerScore CR Bible.

Can someone please provide me the resource for basics and easy->hard questions of this type.

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