Stay organized! And be strict w/yourself...stay on track. Make sure you have designated days &/or nights where a friend or family member will watch the kids, so you can study--a strong support system is VERY important. Also I highly recommend 1-2 days of your study time be out of the house-@ library, starbucks etc. its alot easier to concentrate away from the demands & needs of lil ones. Even if only for an hour, a couple times a week.
Some other tips: set your alarm to wake up 1-2 hours b4 the kids do everyday to study (this is usually easier to accomplish on weekends), get the kids on a set bedtime schedule, so you can have 2-3 hours to study when they go to bed at night.
Take your notes (or flashcards) everywhere with you & study on your breaks, while waiting @ drs office, during your kids extracurricular practices etc. Study, study, study. Put everything you have into it, itll all be worth it in the end!