after uploading documents i am not been able toh fill preference in bhu bsc math hons online counseling what is problem in that
Hope you want doing good in this endemic situation.
The problem you mentioned is actually a very common technical Glitch. No need to worry. Make sure that your documents have been uploaded correctly then close the browser. Then create a new incognito tab and try to login from there this is a common way to bypass this problem. If this doesn't work to do you can write a mail to the concerning authority regarding this problem.
Please don't worry this is a common problem so you are not the only one who is facing this.