It can still be useful if the club gives you access to peers, mock cases, alumni, or recruiting information you would actually use.

The value is not the membership line on your resume. It is the practice and network you can gain quickly.

If the club runs weekly cases and alumni events, joining now can still help. If it is mostly general meetings, your time may be better spent elsewhere.

Look at the next six weeks of club activity and join only if it adds something concrete to your preparation.

yeah, if the club has real mocks, junior year isn't too late