I think the reason why so many people find it hard to focus is because they try to do multiple things at once i.e. they try to multitask which is scientifically impossible for a human brain to do. Yet, they somehow still continue to do it.

Instead, if you focus only on one thing at a time, you're much more likely to complete all your work in time without developing so much of stress.

Quite informative blog @zous! Great effort.