Preparation! I can solve the problems but speed is not up to the mark.How do I overcome this?

Hi,
You got through the first level that is getting questions right. Now, just practice more under timed conditions and push yourself against the timer. Learn some shortcuts and tricks that may save a lot of your time. You can get these shortcuts in any book or site. Just be careful while using them as some of them are not applicable under some particular conditions. Hope this helps. Best of Luck!