Depending on your course you may have to attend every day. That was certainly the case for me. Much depends on the length of your commute and how mind-taxing it is. Get home, do an hour or two and go to bed. It might mean you have to hit the books at weekends. As a mature student you have the advantage of real-world experience of the workplace. Treat studying as work, stay determined and focused and organised. You'll do fine. If there are dozens of first years running around handing in work minutes before the deadline and cramming content two weeks before the exam and still passing, you will manage it nicely.
Don't be too hard on yourself regarding studying and it taking some precedence over family life etc- your children will see you studying, take on board the importance of your work and adopt the same attitude to school and homework which will set them in good stead for their own academic progress.