AIPAC tweeted yesterday that 318 of its endorsed candidates won their elections so far, and since then tweeted about four more candidates whose results showed they won, making it 322.
An anti-AIPAC organization shows 327 Congressional candidates endorsed by AIPAC. I cannot find a full list of AIPAC endorsees for Senate; in March I found an article listing about ten. If AIPAC endorsed between 10 and 20 candidates in the 34 Senate races, and add the 322 endorsed for Congress, that would mean that between 93% and 96% of their candidates won.
AIPAC endorses pro-Israel candidates on both the Democratic and Republican sides. Contrary to how the media portrays AIPAC as being against progressive candidates, I count 34 of their candidates self-describing as progressive.
By any measure, AIPAC has done extremely well this year, including in the primaries, with both its Democratic and Republican candidates.