I will be finishing my 15 month program in two weeks ^_^ So here's a couple things that helped along the way :]
1. Micromedex App - its a virtual drug book and automatically updates itself every time you open it! It has more easy to understand information than most drug books and has cool things like patient education and special considerations. Best of all it's free!
2. Amazon - Get as many LVN type books as possible. You can sometimes find textbooks for $4! Just scope around and read reviews. Also don't be afraid of used books! Every little bit helps!
3. Youtube/Google - Of course you cant believe everything you read on the internet but it can be a great source of information and advice from real nurses which is so amazing (think how much harder nursing school was for the last generation!). Also youtube videos are a great way to switch up the normal read - learn idea. I've heard that if you hear information 3 separate times 3 different ways it will help commit the information to long term memory vs short term (which helps for finals!).
4. Take NCLEX questions all throughout school. Not just before a final or your exit exam. The cool thing about nclex style questions is that if you pay careful attention to the wording of the questions you can pick up ques of the real underlying question and use common sense to get most answers correct! There's a lot of books available that are simply about test taking strategy's and they may seem dull but they help a lot.
5. Get comfortable with dosage calculations, drop factor problems and converting mg->g, mcg->mg, pounds -> kg , etc. These will be the majority of your math questions (at least in my experience), and once you find a way that works for you and you're comfortable then you'll be able to always get them right (they aren't that hard!) and be confident when taking an exam.
That's the best five things I can think of. Hope it helped some! Good luck in school! Stay positive, you can do it!