What droptine said, you need to practice on a 3-d target, one arrow at a time at a variety of angles. study the path the arrow takes an try to envision where the vitals are and where your arrow has penetrated. A 30 degree quarter the entry hole is actually a few inches in front of the rear leg and right about where the ribs start.

Good luck finding the deer, If the hit was high,and one lung,no exit wound low she may bleed internally.