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Nationality, initials and club are HINTS you can access
To make them appear, type "I WANT THIS HINT TO APPEAR 1956" while the cell is selected
(the number you type at the end of the sentence is the one of the corresponding year)
To fill in the hints quickly after you guessed the coach (so you can get 100%!) just type the first two letters of the name of the coach followed by teh first two letters of the surname
(eg type FESC in the hint cells if the corresponding coach is Felipe Scolari)
If instead you feel like making the quiz harder you can try and guess the hints, too
(ie typing the name of the club and the nationality)