Neither History nor the Historians are never 100% correct. Are they?
I have never said they were.
And I have never attached any percentage to history.
History is often written by the victors, so they are bound to be biased or spinning propaganda.
The only way we can verify historical accounts as being "true" or "correct", if we can confirm it independently, for instance through archaeology or through independent historical accounts. The more independent historical accounts you have, the more likely it to be true.
For instance, I think that a large parts of the Bible are myths and legends, not history, like from Genesis (eg Adam) to 1 Kings 11 (Solomon). But we do have certain events in the bible that we know to be historical. The example of this would be the kingdom of Judah (ruled by Ahaz) was under attack by the kingdoms of Israel (Pekah) and of Aram (Rezin), in 734 - 732 BCE; sources: 2 Kings 15 and 16. Now a lot of details given in Isaiah 7 and 8 to be legends, the prophecy of the sign, but we can confirm that there was such attack in Judah and Jerusalem was under siege because of independent source from Assyria confirm it. Assyrian historians recorded the invasion and siege, and that the Assyrian army of Tiglath-Pileser III did indeed intervene and attack both Israel and Aram.
Of course, we can get independent sources, but sometimes the details can differ because of different sides. One way to find out which sources are genuine and which are not, is to read them and examine which one seemed to be distorting the truth. Usually the ones that are exaggerating are not telling the truth. And this happened a lot, often due to propaganda.