I like that material..so kewl so helpful..

Now waiting for similar material/link for Geometry .

Thanks for helping

Thanks a lot for guiding me..I am surely working on OG geometry problems and now look for this suggested KAPLAN book...

For Geometry and Venn diagrams, if you understand the question fully and know what to do then proceed with the steps using the formulas.
Else draw the diagrams.
eg:
Venn diagrams - draw circles depending on the number of groups

Geometry figures - draw the figure - traingle/square etc .. usually GMAT will not give the figures to scale - that means a seemingly right traingle might not be a right traingle, so you will draw a traingle which is not right traingle so that even though you are in a hurry, you wouldnt make the mistake of taking the traingle as right traingle.

Points, axes - draw x,y axis and if points are given then draw the points, or else variables are given then see where can be the variables. If line is given, draw the line. You dont have to be exact, just draw something so that you wont waste valuable time always thinking about the figure.

DS: One major mistake everyone willl do is assume something. The above process will definetely try to avoid such situation
For example:
A quadrilateral, one side is 40 and a adjacent side is 30. Is it a parallelogram?
1). The angle formed by two sides mentioned is right angle.
2). Two diagonals are equal.

Solve the above problem, let me know how you worked. This problem has got good fundamentals about goemetry esp quadrilaterals.

By practise, one can just solve the problem without ever using a diagram in tough questions as well. But that needs practise and there is no harm to paint a picture.

Let me know if you want specific info on anything.

-Chix