I can be pretty forgetful and I'm a bit old school - I just can't bring myself to rely on my iPhone to remember what I need to do day-to-day. That's where my paper weekly schedule comes in handy, and helps me prioritise things!
I picked up an A4 pad of weekly planner sheets (from kikki.k) and every Sunday, I work out when and where I'm working, how much study I need to get done, when my PT session/s is/are, when I'm planning on working out plus when I'll have time to prepare my meals. I often pop my social life into my schedule, too.
If I'm feelin' creative, I colour code each type of activity. I've got a list of things I need to do that week on my schedule, and also a list of goals or things I want to keep top of mind. These change each week (sometimes they're work related, sometimes wellness related etc) and I don't always achieve my goals, but writing it down sets your intentions and reminds you each day of what you're trying to do to better yourself and look after yourself.
Then I stick that schedule above my desk where I can clearly see it.
For me, it's a way of brain-dumping so I don't feel overwhelmed during the week. It helps me prioritise the things I "need" to do - it puts working out on par with working, shows me that I can keep my social life if I get all my study done.
It helps me prepare and set myself up for success because, let's face it, I'm not great at managing my time and this little piece of paper is like my weekly dictator for how I use my time. Some weeks I overthrow the dictator, but I find I'm a much nicer person when I'm under its rule.