In a Jewish bar mitzvah Torah service, the raised reading platform is called a tevah in Sephardi Hebrew usage.
The tevah is the platform or table from which the Torah is read in many Sephardi and Mizrahi synagogues. It is often positioned in the center of the prayer space, allowing the congregation to gather around the reading. The reader places the Torah scroll on the table and chants the assigned passage there.
In many Ashkenazi communities, the comparable platform is more commonly called the bimah. The two terms can describe closely related synagogue spaces, but regional and denominational vocabulary differs. This variation is why a question about the platform should specify the tradition when seeking one precise term.
At a bar mitzvah, the celebrant’s Torah reading, blessings, and related honors take place in relation to this central reading area. The tevah is not the aron kodesh, which stores the Torah scrolls, and it is not the parochet, the curtain in front of the ark.