Which job should I take?!

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I am a nanny. I am also a full time student with a demanding workload but a flexible schedule. Here are the job descriptions:
Job A: met with the mother last week. She is an attorney, very serious but very kind. She has 2 young girls (4 and 5). Her schedule demands that I handle taking the girls to school in the morning, I would then come home for a few hours to study, and then pick up the girls from school to bathe them, feed them, etc until mom returns from work around 7. 35 hours per week. 
Job B: met with mom yesterday. She is a stay at home mom but has always had a nanny. 12 year old girl and 7 year old boy. Job would be to get kids from school, feed them and make sure the house is tidy. Supervise the 7 year old if he wants to play outside. 25 hours per week. 
Both jobs will pay the bills, but Job A is an additional 4-500 dollars per month with a less flexible schedule. Job B is very flexible but not a lot of extra spending money. 

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