Have you started the degree this year? If so, you're still finding your feet. You're very early on in it and it takes time for your body to get used to the routine.
If you and DD are out of the house all day, then the house can't be too messy, so not that much 'tidying' to do. Perhaps follow a routine such as Fly Lady, which gives you strict jobs to do for the day, which makes sure you keep on top of things.
Plan your meals for convenience. So either invest in a slow cooker, or have some very quick meals that you can prepare. Or cook double and have a re-heated dinner the second night. BUT... make sure you are getting all the nutrients you need. Might be an idea to take some vitamin and mineral tablets just in case. Even a slight dip in iron levels can leave you feeling much more tired.
Don't get up earlier than you need to. Obviously this is dependant on when your DD gets up, but have your clothes for yourself and your DD ready for the week, and in the mornings cut the jobs down as much as possible.
When you sit down to study in the evenings, then don't get all slouchy on the sofa. Sit down properly at a table. Try to do 'busier' study jobs in the evening, just reading will be more likely to make you tired. If you are reading, then take notes as you go along.
Get efficient with your study. If you take good notes during your lectures, then type them up that same evening, adding in extra details as you go along. It is amazing how much more you will remember from your lecture notes if you do this, and it will be a huge help for tutorials etc. File things away in your notes folder properly, and do it straight away. You can't afford wasted time looking for your notes. If you have exams that require you to memorise facts, then spend some time in the evenings dictating them and then listen to that dictation on your commute.
Good luck. It will be hard, but worth it. The first six months in particular. Then you'll hit other dips along the way, where you just feel ground down and the end will seem far away. But keep the motivation and your health up and you will get there.