Candidates while applying through the official site should ensure that whatever details they are filling should be authentic as any discrepancy will lead to rejection of the application. Prepare for the skill sets you have mentioned in the application. Be confident while answering questions and shine bright in the selection list.
first go through sllyabus, solve problems as much as possible. there is also a negative marks for incorrect answer. if you don't have any confidence in any answer then don't try to touch the question