The surest way to crack the CAT (for well prepared aspirants only, of course) is to take a shot of 'methylphenidate' (also known as 'Ritalin') an hour before the test.
This drug is a central nervous system (CNS) stimulant and is used in extreme cases to treat Attention deficit children.
Once the drug takes effect, the well prepared candidate will be able to mentally function at his peak for a full three hours. Nothing will distract him ever.
