I've yet to see Rebuild 3.0 but I would venture that it probably won't.

The reason being that the Rebuild series isn't just a retelling of the original story with new animation. While Rebuild 1.0 is basically the first six episodes of the original TV series with (much) better animation, Rebuild 2.0 departs quite a lot from the original, extensively reworking the character of Asuka and adding a new character.

I would recommend seeing the original TV show and then watching End of Evagelion, or at least starting from episode 7. It should give you some historical context for the franchise and probably provide you with some interesting insights, specifically the infamous last two episodes.

I've yet to see Rebuild 3.0 but I would venture that it probably won't.

The reason being that the Rebuild series isn't just a retelling of the original story with new animation. While Rebuild 1.0 is basically the first six episodes of the original TV series with (much) better animation, Rebuild 2.0 departs quite a lot from the original, extensively reworking the character of Asuka, adding a new character, and changing some very pivotal events.

I would recommend seeing the original TV show and then watching End of Evangelion, or at least starting from episode 7. It should give you some historical context for the franchise and probably provide you with some interesting insights, specifically the infamous last two episodes.