Almost all the top Coaching Institutes provide Crash Courses. These courses are fast paced and are mainly to brush up concepts. You can also opt for them if you want to learn a few concepts that you are lagging in.
However, having said that, you should not look for them as a sole option that without effort of 2 years course, you can finish everything in 3 months. That will be a stretch.
These courses have a very definite target crowd and you need to judge carefully whether you belong to that.