Which is an effective way to manage stress? practice multitasking. eat a high-protein diet. keep an active calendar. maintain a regular sleeping schedule.

Keep an active calendar because then you will be able to manage your time, do the things you love and get distracted from stress

All of those are fantastic ways of managing stress. Though maintaining a regular sleeping schedule and having an active calendar are the most important. Regular sleep cycles give your life routine, and with routine comes a mundane life. I'm not saying you should not be adventurous or active, but knowing your routine, what you will do when you wake up in the morning, when you're going to sleep, when you're going to eat, when you need to study or do homework, all of these remove the stress of 'not knowing' from your life. Also, have an active schedule! Keeping yourself busy with simple tasks, cleaning, organizing, or even something more artistic like writing or drawing distract you from stress and the negative effects of dwelling on it. In short, be active and plan your daily life so you can avoid or more easily manage the curve balls life throws at you.