GMAT Strategy

Greetings,

I hope you are doing well.

A month from now, I have to appear in a GMAT-like exam in a local university. I tried previous year but I scored really low in their maths section because it contained questions like below. My question is that what is the best resource to master such questions (a resource that contains tips and tricks to master such questions and also contains lot of practice questions). All help is really appreciated.


Question:
In a game, exactly six inverted cups stand side by side in a straight line, and each has exactly one ball hidden under it. The cups are numbered consecutively1 through 6. Each of the balls is painted a single solid color. The colors of the balls are green, magenta, orange, purpose, red and yellow. The balls have been hidden under the cups in a manner that conforms to the following conditions:


The purple ball must be hidden under a lower-numbered cup than the orange ball.
The red ball must be hidden under a cup immediately adjacent to the cup under which the magenta ball is hidden.
The green ball must be hidden under cup 5.

1.Which of the following could be the colors of the balls under the cups, in order from 1 through 6?

(A) Green, yellow, magenta, red, purple, orange
(B) Magenta, green, purple, red, orange ,yellow
(C) Magenta, red, purple, yellow, green, orange
(D) Orange, yellow, red, magenta, green, purple
(E) Red, purple, magenta, yellow, green, orange

2.If the magenta ball is under cup 4, the red ball must be under cup

(A) 1
(B) 2
(C) 3
(D) 5
(E) 6

3. A ball of which of the following colors could be under cup 6?

(A) Green
(B) Magenta
(C) Purple
(D) Red
(E) Yellow