The homework very difficult yesterday

“He does [his] homework” is correct, for simple present tense: meaning, he does homework habitually. More common, since usually people describe what they are currently doing for such things, is: “He’s doing his homework”. That means that he is currently, at this time, doing his homework.

Those lost hours could be explained by Parkinson’s Law, which states, “Work expands to fill the time available for its completion.” In other words, if you give yourself all night to memorize those geometry formulas for your quiz tomorrow, you’ll inevitably find that a 30 minute task has somehow filled your entire evening.

In school, start your afternoons by completing the easiest assignments: doing so will motivate you to move onto the harder ones. This is called “grabbing the low-hanging fruit.” At home, same thing: pick up a few items off your bedroom floor before you dig into your deep cleaning routine.

Despite the above advantages and disadvantages of tackling the easy or the hard homework first, there really is a proper way to approach your homework assignments that will set you up for getting more done. And here it is: Do what works for you!