Multi-tasking may be a productive goal for reaching success, but recent findings have shown that it's just an illusion; our brain has evolved to do focus on one task at a time.You can use this knowledge by taking certain amounts of time in your day for each task and do them individually. Don't think that it will be a waste of time; if you try to do all at the same time you will take much less care in each of them and therefore produce a lower quality of work.