Can you give me some advice on how to best manage time?

I have 22 credit hours this semester with a month to go until the end of the semester. I feel like I am moving in slow motion straight towards a train wreck trying to keep everything together! I have a lot to do before the semester ends and possibly physically not enough time to do it all. What is the best way to maintain focus in this critical time and make it to the end? I need some advice and strategy. I am not great at time management. If I work non stop I get burnt out and when I take breaks I can’t get any sense of relaxation because my mind always starts stressing about all the work that needs to get done. Please help!