Time management is important for both your academic and career success because the amount of time you take to complete your work affects every aspect of your life. The quicker you finish your assignments, the faster you get your work done. Which will give you the advantage of a lower stress level and helps you with more opportunities in the time you have left. It helps prepare you for tests like the SAT or ACT which is timed or any test that has a required time limit. It will affect your career success by giving you a better view point to your boss, manager, co-workers, customers, etc. Tt will help them see you as more reliable and helpful which will gain you success. The faster you get done with stuff in your job (or on time) the faster you’ll be done and the more money you make (depending on your job).
Hopefully this helps...