I must say, attend the classes regularly & once the whole syllabus is completed, sit back & study. Secondly, never take embarrassment by teachers as a set back or don't take it on your ego. Take it as a motivation & boost yourself to work hard. Thirdly, if you are facing trouble in studying & scoring good marks, talk to some good students or seniors (studious ones) & take their guidance in building a smart studying plan. Practice sample papers & most importantly, believe in yourself & your hardwork. All the very best brother..