Education at a top worldwide university is very expensive and requires a huge deal of commitment. Remember: with top worldwide universities, you wouldn't just have to deal with honing your academic skills; you also have to research the practical aspects as well. Here are some ways to get started:
Establish a calendar. Create a calendar that will help you keep track of deadlines and other important dates to remember regarding the application process of the schools that appeal to you. Remember that if you plan to go to a school outside your country, you have to allot about two to three years of preparation, especially if your proficiency in the school's native language is low. Break down tasks month by month to make your calendar more manageable.
You may check out this website: http://www.4icu.org/top200/ to help you gain information on what are widely recognized to be top universities of the world. From here, you can acquire more information on the universities by visiting their official sites and checking out other perceptions about the universities and their notable characteristics.
Take the required tests. It's best to get information on what specific examinations the university requires, as early as possible. Remember, you need to have ample time not just to take the test, but to study enough to excel at it! If you plan to get into a top US university, for example, you have to take the Test of English as a Foreign language (TOEFL); most American universities require minimum scores for admission: 550-610 points for TOEFL Paper-based test, and 213-253 points for the TOEFL Computer-based test. If you feel your scores are not satisfactory, you may choose to retake an exam after enrolling in intensive English courses.
Learn about the standardized entrance exams, such as SAT, GRE, GMAT, if the university you are applying to is in the US. Research other tests specifically required by the university you're applying to.
Submit other requirements. Research the school's other requirements. In the US, that would usually be an application form (make sure you request one for international students), two or three recommendation letters, official academic records or transcripts in English, an essay, and application fees (which typically range from $25-$80). Be advised that some of these requirements may take a long time to process, so request them in advance.
Research other required documents. Check the student visa requirements and go to the embassy for further details. You may also opt to obtain other information there regarding the country and available scholarships.
Prepare financially. Going to school in another country could be very expensive, and the financial arrangements must be well-established long before you hop on the plane. In the United States, for example, you'd need to prove to the State Department that you or a sponsor could indeed finance your education and your living expenses while in the US. Don't rely too much on receiving financial aid or scholarships from the US, as it is rare for an international student to receive one.
While preparing your financial plans, research the standard cost of living in the country you're planning to go to. Make sure that apart from the tuition and travel costs, at least your room and board can be covered, plus some allowances for unforeseen expenses. Obtain information on health and travel insurance as well.
Know as much about the country as possible. If you want to apply to Keio University in Japan, for example, brush up on your knowledge of Japanese cultural norms and behavior. Or perhaps you'd like to get into Ecole Normale Superieure in France, so be familiar with the European lifestyle. Remember, if you get in the school of your choice, you're not only going to acquire education there but the country's culture as well! The key is that when you get to that country you should be familiar enough with it such that you will minimize the shock that invariably comes with living in a culture other than your own.
It's good to aspire for the best, and with proper planning and preparation you have a clear shot at attaining it. Good luck!