Hi Camille,
The answer depends on how much time you have and what scores you need. It's very easy to get overwhelmed and study in circles, so the first thing I do with my students is to create a study plan. If you've taken the TEAS before, use the detailed list showing you which areas you missed.
For math and English, the best resource I've found is IXL.com. It's designed for kids, but it let's you choose a precise area to focus on.. For example, you can search for "convert between percents, decimals, and fractions" (math) or "identify direct objects" *(English). The questions give you instant feedback, so you'll learn quickly.
If you aren't sure where to start, then go through the sections for 7th or 8th grade. Don't be discouraged by the grade level, these are the topics heavily covered on the TEAS and they are probably skills you haven't practiced for years. I recommend working on each skill until you score ten points higher than you need on that section. For example, if you need a 70 on the math or grammar section, then work on each skill until you reach 80 percent mastery.
They run specials, but IXL usually costs $10-20 a month. Most students only need to subscribe for a month or two.
For reading, you can use IXL, but my students have more success with test prep books. The ones I like are the McGraw Hill TEAS 6 Review and their set of practice tests. The Kaplan book is good also. If this is an area where you need practice, go to Goodwill or your local library and get as many TEAS, HESI, SAT, or ACT practice books as you can find. For the HESI, SAT, and ACT books, only use the short passages (the long passages aren't on the TEAS). The reading sections for the TEAS hasn't changed since the TEAS IV, so old TEAS books will work too. Aim to do at least one reading passage a day.
The Science section is the most difficult to study for. If you've had anatomy and physiology recently, that will be a great advantage. The ATI TEAS Review Manual is the best for Science, but its very dense and easy to get overwhelmed. Focus on the A&P, biology, and chemistry sections in that order (unless you are already scoring high). The ATI manual is expensive, but you can often find a used copy on Amazon or Ebay.
I've written several of my own materials also. Let me know if you need more guidance. I've been helping TEAS students for several years now, so I know the test very well.
