Elitmus Exam

I'm going to appear in elitmus test this sunday. Any tips plz??

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Elitmus Other Question
what are the important points to keep in my mind for LOGICAL REASONING part.
suggest tricks are points to remember for
I)CRYPT-ARITMETIC
II)DATA INTERPRETATION
III)ARRANGEMENTS/SELECTION

 1) A square with side 5 cm, mid point of the sides are joined to form another square, if this process is repeated, find perimeter of 9th square.
2) find sum of first 1234 term of series, 1,2,1,2,2,1,2,2,2,1,2,2,2,2...
3)Z(n)=2S(n)+41, S(n)=sum of first n natural no, Find lowest number for which Z(n) is prime a)6, b)7, c)40, d)Z(n) is always prime
4)2 circles intersect at point AB, arc made by smaller circle is 90 degree and that of larger circle 60 degree, find area of intersection.
5)P is point inside triangle ABC at distance 8,6,12 cm from A,B,C respectively, find perimeter of ABC.