I just graduated from an accelerated BSN program (17 months), and I have a preschooler. We did eat out more than I would've liked, especially in the beginning. However, towards the second half of the program, I got meal prep and simplifying meals down pretty well.
Thursday or Friday afternoon, usually during lunch, I'd jot down a list of ONLY 3 meals for the next week (I cook enough for leftovers usually since it's just me, my hubs, and my son). Friday evening, I jot out my list of ingredients for stuff I had to cook, plus our normal breakfast items for the week, then shoot a text to my hubs to see what he needed from the store. I wrote out the grocery list and put any coupons with it. My husband enjoys grocery shopping so he'd take the list and the coupons and knock that out Saturday morning.
I try to keep it super simple... think 2-3 ingredients per meal (because I would buy 10 ingredients for a meal, never use them, and throw them out - You'll be busy!)... so Caesar salad kit and seasoned shrimp/chicken, Gorton's fish fillets and fresh green beans in olive oil with a little garlic salt, chicken/steak/beef Tacos and rice/beans on Tuesday, one of the healthier versions of pizza on Friday, leftovers on whatever my clinical day was.
On Sundays, I meal prepped. This also included healthy snacks/lunch items for everybody. While I would cook chicken/shrimp/beef, or whatever meat for the upcoming week, I would prep snacks to be available in the fridge. Boiled eggs, yogurt, string cheese, celery sticks, PB packs, green pepper, baby carrots, applesauce packs, true moo, water, apple slices, grapes, strawberries, etc. I also tried to keep healthier lunches prepped for me... usually tuna or chicken salad on romaine lettuce with avocado, chicken wraps, brown rice with chicken, a little soy sauce, and steamed veggies (you can buy packs of those in the frozen section and they're great as add-ins or as already-seasoned sides by themselves).
I enjoy cooking/baking so if I really wanted to cook a more complex meal, with more ingredients, or if I wanted to try a new recipe, I would plan that for the weekend or whenever I had a few free hours. In my program, I didn't have a ton of free time during the week.