Elitmus Exam Numerical Ability Sequence and Series

which book should i prefer for aptitude an for reasoning plz help

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Elitmus Other Question
there is a box half fill with pencil and add 3 pencils more. a)it's quantity increases 1/3 in box.
b) box capacity is 9

i)one is alone sufficient other is not alone sufficient
ii)both is together
sufficient.
iii)either is alone sufficient
iv)both is not together sufficient How many four digit can be formed using 2,3,4,5,6,7 only once divisible by 25
a 12
b 20
c 24
d 40