Actually, the point values should be printed on each tile so they do not have to be memorized, though it may help in considering the opponent's responses if they have certain letters that combine with yours.
And it's also acceptable to have a pre-printed scoresheet where one can track the letters that have been played so that would show the frequency of each.
Tracking helps one a lot at the end as you know what letters your opponent has and can adjust your play to suit. Of course, at most tournament level play, they have been tracking and know your final rack too.
Also you need to memorize the different point values of the letters and different tile frequencies for Spanish or French.