documentclass{article}
usepackage{tabu}
newcounter{lesson}
begin{document}
begin{tabu}{@{}cp{{.1667textwidth}*{2}{p{.3333textwidth}}@{}}
Cnt&Something&Other something&Another something\
hline
endhead
stepcounter{lesson}thelesson&Blah-blah&blablablablablablablabla&blabalblabla\
stepcounter{lesson}thelesson&Lorem ipsum&ecc-pecc kimehecc&Abrak a Dabra\
% and 142 more lines...
end{tabu}
end{document}