Hi!
The official date for the REET eligibility test in 2026 has not yet been announced. As per media Reports, the exam may conduct in late 2026 or early 2027.
the answer for Your other question about Rajasthan Pre DElEd (bstc vale jo abhi exam denge vo bhi yeh exam de sakte hai khya),
go to this link - https://competition.careers360.com/hi/articles/reet
Hope this article clears your doubts.