Elitmus Exam

hi actually m going to appear for elitmus test on 13th oct plz tell me strategy to follow to get above 90 % ile..thanks

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Elitmus Other Question

f(x+y)=f(x)*f(y)
f(1)=1.6,
If f(1)+f(2)+f(3)+....+f(n) lies between 24 and 27. Find the value of n?
How many different 4 digits numbers are there which have the digits 1,2,3,4,5,6,7 and 8 such that the digit 1 appears exactly once
option
a. 4.7^3
b. 8p^4
c. 7^3