Dear Raj <

If you are fail in one subjects math in WBCHSE this year then no need to wait for 1 year might be this year onwards because mostly re exam conducted after 45 days of result published but due to covid 19 it will take some time but they conduct re exam only for those people who are failed in 1 subject and you will appear this exam and if you will pass this exam then you will get pass certificate .

I hope it will helpful

Thanks