CBSE history didn't teach us anything about Sambhaji

I'm just shocked at how a huge chunk of history was completely left out from the CBSE history textbooks. Just finished watching Chava and my mom who studied in state board knew more about what had happened than I did. State board seems to have more depth when it comes to history . I had no clue about any of the things shown in the movie.I can't help but feel disappointed.