Is one year enough for cat preparation?

Yes it's more than enough for CAT exam preparations. You need to start with basics in each of the section. Make sure that before you move to any difficult part of any chapter, your basics are all clear and are very strong. This will help you in solving questions at a good speed and accuracy. Believe me if your basics are strong of all 3 sections then you can score upto 80 percentile without any much difficulty.

Now along with this you need to give lots and lots of online mock test and analyse each test's solution thoroughly right after the exam which will help you in overcoming your mistakes and come up with a strategy to attempt your paper which will definitely help you in improving your marks and percentile.

These tests will also help you in knowing your strength and weakness so that with time you can enhance accuracy rate with good speed on your strength part and work on your weakness to turn it up in strength.

Work hard throughout a year, then its definitely enough to score a very high percentile and with a decent profile crack a call from top colleges.

All the best for your preparations!!