Congratulations on your last year! Yes, college and student days will not come back - the friendships and the fun which you might have when you move on to your next level in life will not be the same! So my advice is enjoy the college life while it exists. Of course, you also have to be focused to finish the last round and get good grades. But you seem to be a student who knows what to do!
Also, you should already start making plans aboutt he next step and jump into action regarding that: like preparing the resume, shortlisting the companies that you want to apply and research about them and start sending out applications! I am sorry if I sound like trying to spoil your fun. But the real bubble burst comes now: you might think that when you earn your own money you can spend it on whatever and however you like. It usually doesn't happen so! When people start earning money they will even think thrice before buying a new pair of shoes - own's own hard earned money is more valuable and they hate to spend it! So my bet is most probably you will open a savings account and start saving! ;)
Anyways, all the best!