I wish I'd tried harder in my first year (I'm doing a law degree). Even though it doesn't particularly count, it does not look good on your results to have a pretty average first year. Although to be fair, it is A LOT better to mess up your first year than any other year.
Also, that you don't need to buy every recommended textbook. I have spent a large amount of money on books, (law books are expensive). Moreover you can get cheap second hand books on Amazon - i also try and get books with notes already written in by the past owner, its very interesting to see someone else's view.