Library Databases have millions of articles in them, and the broader your search terms, the more irrelevant results you will get.
So, if you search only for test anxiety, you will get thousands of results about a variety of things, many of them not related to your topic.
You can use subject headings, which will narrow your results significantly. Subject Headings are tags put on articles that ensure that the article you're looking at is about the topic rather than just having the words somewhere in the article.
After you've added more search terms or used subject headings, you can find different types of articles about your topic.
You can limit to a variety of types of articles, depending on what you need. Some helpful types of articles are:
As you're narrowing your topic, you may find that you're focusing on a specific age group. For example, test anxiety in elementary school children rather than adolescents.
In the advanced search of Psycinfo you can search specifically within age groups so that you do not need to review studies that are studying different age groups.
As Psycinfo is made specifically for research in Psychology, look at the Advanced Search screen and see if there is any way for you to get articles that best match your research, whether it is age group, methodology, or finding your specific topic.