Many tests and measurement instruments that have never been distributed commercially have been reproduced in full as compilations within or as appendices to published books.
Below is a web site created by a librarian in the United States that allows you to search for tests that she has located in full text within other works.
Further down is a select list of books in our collection known to contain the full text of test instruments.
Below is a selection of books that are known to contain the full text of a range of tests and other instruments. To find other similar works for yourself, you may wish to try searching the library catalogue using keywords for your topic together with a variety of terms for tests, eg
intelligence and (test* or measure* or assessment* or instrument*).
You will then need to inspect those works to see if they include the full text of actual tests.