It’s a good idea to study for a government exam while working elsewhere. You’ll be always on the lookout for ways to put your spare time to good use in order to meet your goal. When you work, you will engage with a wide range of people, and your interactions with them will be a valuable resource. Your self-confidence would rise, and you would feel compelled to study rigorously for the government exam in order to complete the curriculum and achieve in your endeavors. You may be surprised to realize that you have reservoirs of energy and potential that can assist you in achieving your goals.
I am not sharing any preparation tips, if anyone has followed like this can share his experience.