It depends on the exam for which you are going to prepare. If it is an exam in which only a 12th or lower degree is required, Preparation can be started just after 12th, but if it requires a graduation degree you have to first complete graduation. However, preparation can be started in the graduation itself.
Tips to prepare for competition:
- Know Your Eligibility.
- Know Your Syllabus.
- Refer to Good Study Material.
- Create a Study Plan.
- Device Your Strategy Well.
- Practice Mock Tests.
- Work on Your Weak Areas.