Research says that multitasking can make a person less productive. When you are doing multiple things simultaneously, you need to switch your mind from one task to other. This can reduce the concentration on your main task. And when you do many things you will not be able to finish any task completely. This increase the stress that you have not completed any task on the to-do list. Instead, if you do one task at a time, you can finish tasks one by one, and you feel satisfied with working for a long time, unlike the previous way.
Getting one work done at a time brings more of the productivity based on your concentration. When you think to go for multitasking, you are distracted from your focus, you are never going to concentrate on one task. you would think I should finish this as well as this but ultimately due to diversions, you will face the failure in the completion of the tasks.