My dear: you are confusing in two points. First which university should i choose and second how could i get employed by Big four.First,which university is famous in Accounting? there are many of them,but i am not sure what's your academic foundation.You are only in a senior school and know about what is CPA and ACCA and Big four,i could say you are a very ambitous person.you have already designed your career. you are very clear in your mind.some advices.a reputable colleges is very important,a good exam result in your graduate certificate is also add some credits.Participating some activities and events will prove your ability and ACCA will give you more points but not guarantee you will enter into Big four.CPA is not allowed to be taken during your college life.Do not waste of your time.Concentrating on your senior school exam first.otherwise all your dreams are dreams only.