If you are eager to crack upsc examination you should preffer BA for your graduation. This is not mandatory,it is because the questions asked by upse are more relatwd to ARTs subject. Either if you want to go through BTech no problem! You may. It regulates your ability to study and inhances time. As you are aPCM student you are thinking that if you choose BA your friends mocking on you. If you are fully focused on your career so forgot about what the people think about you...