Is dropout after 12th is good idea??
There are two things which You need to analyse before a year Drop after class 12th.
1. Without Your drop can You achieve Your ultimate Dream, Many students take a drop to get into IIT, where they will become Engineer which they can without a year drop but You must compromise some world-class facility.
2. Will You able to get what You want after a year Drop, You know Yourself better than anyone else So be honest.
If you find the answer to both the question affirmative then Go for a year Drop otherwise Not.