how do I optimize my chances of getting scholarships ?

You have to cast a wide net! There are thousands of scholarships out there but they are not all listed in one place. Therefore, you have to start you search on the web and just Google "scholarships". In addition, there are scholarships for almost any category you can think of. They are broken down by majors, G.P.A, interests, clubs, hobbies, sports, volunteer work, etc. You will have to be patient and willing to put in the time and effort to complete all the applications too.