High school...?

afraid for it..... Im in middle school right now,and i have all A's ... but i do my homework before its due... i nver take it home.... Im wondering if i should start doing it bcz in high school it will be worse and i rlly wont have time to do it b4 its due...... What do you guys think?? And i nvr study for tests; i listen in cl... do u think ill not be good in high schooll.... shuld i start doing my work ahead of time and start studying to get in the habbit ??