What do the different hesi's mean? a2, v1, v2????

  1. I don't think my school requires passing hesi's, but we take them at the end of the sememsters to see what we know.. when i look up hesi online, i see words like a1, v2, etc,,, i dont know what all that means,, but I want to get a good hesi study guide,, and so i don't know what i'm really looking for,, and anyone explain the types and recommend any guides?