Publishing papers during the undergraduate period is of little help to postgraduate entrance examination.
Postgraduate entrance examination mainly depends on the results of the initial test and retest, and the admission basis is the total score ranking of the initial test and retest.
If you have published a paper during the undergraduate period, it may be helpful for the postgraduate entrance examination interview, that is, you may gain the favor of your tutor and get high marks in the interview, but the interview results are only a small part of the total score, because the total score also includes the preliminary test results and the re-examination written test results.