Dear Md Rafiur Rahman I wrote here https://www.researchgate.net/post/OPAST_Publishing_Group the following reply:

Well first of all the publisher OPAST is mentioned in the Beall’s list (https://beallslist.net ) of potential predatory publishers. This is a red flag and by itself not enough to say they are predatory but there are more red flags:

-The most important is that their indexing info (https://www.opastpublishers.com/international-publisher/indexing-abstracting.html ) is full of so-called misleading metrics (https://beallslist.net/misleading-metrics/ ) such as OAJI and CiteFactor often used by predatory journals/publishers

-Their prominently mentioning of PubMed articles is a misleading practice (again often used by predatory journals/publishers). It is misleading since PubMed index papers where at least one of authors has a NIH grant and this is irrespective of the journal (in other words it says nothing about that particular journal)

-I checked one of their “most popular” authors and the picture they used for a certain Dr. Galyna Khrushch https://www.prof-medicina.ru/liposakciya/article/korrekciya-figuri--s-pomocshu-rf-liposakcii-body-tite is someone active in liposuction etc. but looking at Google Scholar not very active in writing serious scientific papers (actually I found none)

-See for some more arguments why one better should avoid this one my reply of August 7th , 2021 here https://www.researchgate.net/post/I-wish-to-publish-my-article-in-Journal-of-Chemistry-Education-research-and-practice-it-has-been-accepted-for-publication-but-am-not-sure-if-it-real

Best regards.