Do something like TopCoder SRMs or CodeForces rounds. They are not only fun but they take up only about 2-4 hours of effort per week. You can judge yourself how

Do something like TopCoder SRMs or CodeForces rounds. They are not only fun but they take up only about 2-4 hours of effort per week. You can judge yourself how well you are doing compared to college kids and competitive programmers. After the contest, read the editorial about the problems that you could not solve during the contest. After about 3-6 months of this, I can confidently say, I can pass the pure algo/data-structure rounds of any company..