The Japan Foundation recommends the Irodori: Japanese for Life in Japan textbook series, which is available for free online. The Irodori books and online course are directly aligned with the Can-do framework used to create JFT-Basic questions.
YouTube has become an excellent source for free JFT-Basic mock tests. Channels dedicated to Japanese language exam preparation offer full video-based mock tests with answer keys, allowing you to practice listening comprehension, vocabulary, conversation, and reading in a simulated environment. JFT Basic A2 -FREE- Full Sample Test-jft Mock Test - S...