Looking for practice quizzes or similar

Hi! Im a software development trainee at a consulting company. I am looking for a way to practice the concepts they’re going to ask me about in the interviews. I wanted to know if someone know of good quality quizzes i can take regularly or some other resource that can help. I am also trying to practice with coding challenges on code wars but im concerned about the theory and technical concepts. Im working with java, JS, html, css, react, SQL and such.