For specific requirements, it’s upto the scholarship you’re applying for but if you want general requirements here they are: Excellent academic record, good participation rate in school activities and extracurricular activities, recommendation letters (at least 2) from teachers that know you best, and having good communication skills will increase your chance of winning a scholarship. And there’s almost always an interview so be prepared for that. Be confident and be genuine. You should be fine if you have these on your checklist.