Preparing Yourself in General
Mentally prepare yourself. So you’ve got about 2 or 4 weeks to the Olympiad. You need to be ready to work hard and cover all topics in the limited time frame you have.
Create a schedule. A typical schedule has 5 study days followed by a day for testing yourself and a day for rest and recap. However, you could modify it to suit your needs. You will have to stick to your schedule for the remaining time.
Keep reinforcing your basic concepts. Since most Olympiads are concept-based and objective (multiple choice question type), all you need to do is reinforce the basic concepts which you already know. So, for example, if it is a mental ability Olympiad, you need to stick to cubes, matrices, number and letter sequences, blood relations and so on. If it’s a varying Olympiad i.e. if it has many subjects covered, you will have to study all the concepts thoroughly.
Visualize yourself as a topper. The key to performing well in any Olympiad is being confident mentally. Keep visualizing your success, and it will come to you.
Stick to your schedule. Cover at least 85 percent of the topics that are needed. Your priority list should be in such a way that you study the high weightage topics first, and then the ones with lower weightage. so clearly, in a varying Olympiad, you need to finish off mental ability first and then maths, followed by science and languages at last.
Eat and sleep well. You’ve probably read this enough times, but one cannot emphasise enough the importance of eating and sleeping well. You do not need to study late at night in order to do well. Sleeping helps brain to retain any new information (boosts memory) and also helps balance out any stress. Waking up early is better since the mind is fresh.
Move on to other topics only when you are comfortable with the current topic.Most people just try to complete the syllabus, but it is more advantageous if you cover fewer topics which you are completely sure of, since you will be able to answer all or most of the questions from the topic correctly.
Solve sample papers. Almost all Olympiads have online sites where you can get previous year papers for minimal costs. if you do not have access to these, you can always ask your friends to create mock papers, and then solve them within the time frame of the actual Olympiad.