hey emma,
i would suggest taking about 3 cases first. study them closely and figure out, what exactly do u need from them.
consequently, develop a template.
u can use the template to study the other cases. this way, u can use the template to skim the other cases quickly.
u might also want to group the cases together. there might be 207 individual cases but maybe, with the template, u can study the similarity of those cases and group it into 5 - 6 main groups. this should speed things up.
explain the main feature of each group and how they differ. then, explain the special cases as the need arise. hope this helps.. all the best emaa!