Which revisions? Each Jewish sect, be it Sadducees, Essenses, Samaritans, Pharisees, Alexandrian Jews, etc. had their versions of the books. The only sect that survived and claims monopoly on Judaism, is the rabbinic Judaism of the Pharisees and their scriptures (Masoretic Text), or Tanakh, aka the "Old Testament".
The oldest copy of the Tanakh (10th century AD, Moscow synagogue) fully agrees with all other copies of the Masoretic Text scrolls made prior or subsequent to that date. So, unlike Christian books, the Jewish books retained remarkable consistency.
Differences in Jewish scriptures are related to their sects, not copyists. Thus, Samaritan Torah differs form the rest and the Essene books do not always agree with the MT, just as the Alexandrian LXX differs from others (textually and canonically) while partially agreeing with Qumran scrolls.
That is my understanding.