List. Write a list. And then, prioritse those things on that list.
Okay so you've probably figured out that when you have many things you need to get done, the best place to start is by writing a list. This helps me in so many ways, it helps to clear my head, helps me realise that stuff is manageable and it gives me motivation when I'm ticking things off. I find it helps to write more achievable tasks such as 'research xyz', 'pick an essay title', 'plan essay', 'write introduction' rather than 'write essay'. No-one, well maybe some people, sits down and writes an essay in one go, approach it in bite size chunks and it'll help you not to panic. I also find it really useful to number the list so you know exactly what you need to be doing. Start with the most important and work your way down that list.
Get up an hour earlier. 60 minutes. You can do it.
Well you can try. I'm not a morning person in terms of getting out of bed, but I am at my most productive at the start of the day. When I've got a lot on my plate, I try to wake up an hour earlier than normal and power through my to do list. I usually start with an easy task followed by the most important/difficult task of the day that I absolutely MUST do, this is when my motivation and productivity is at its highest.
Don't panic and do nothing.
I know all too well how easy it is to put your onesie on and curl up under the covers and try to forget about all of your responsibilities and pretend that if you hide they'll go away. We both know that they will definitely not go away. In fact it's a damn good way of getting yourself more stressed. When I feel like getting into bed even though I have so much to do, I tend to give myself 30 minutes to relax, do something I want to do, and then when those 30 minutes are up I get my head down and focus.
Know how you work best.
You will really need to focus hard when it comes to multiple deadlines. If you work better with music on in the background, play music. If you work better in the library, get yourself to the library. Get to know how you work best and do that!
Talk to people.
I don't mean spend all your time talking to your flatmates instead of doing your work. I mean letting your friends and family know that you're going to be busy. Confiding with people close to you about being stressed, and getting everything off your chest can also help you feel better. And chances are some of your uni/school friends will be going through similar things. If your work load is physically impossible and you know that you aren't going to be able to meet all your deadlines, then it's worth talking to your personal tutor or lecturers about your situation as you might be able to get an extension.
The main thing to remember is that it'll all be worth the stress and hard work in the end, whatever you're doing! If you have any other useful tips, leave them in a comment!