@BAYMAX I think that it's better to discuss a tag on meta first rather than directly creating it.

So if you still feel that tag related to competition exams would be useful, you should first have a look at the past discussions - a few of them are linked here: https://chat.stackexchange.com/transcript/3740/2017/12/16 If you still think that such tag should be created, make a post about it on meta to get opinions of other (more experienced) users about the new tag.