For more exercises and tests on Spanish adjectives, please visit this site in French: http://www.espagnolfacile.com/cgi2/myexam/liaison.php?liaison=_adjectif_
I would also suggest you watch this video about Spanish adjectives. While the person is speaking you can read along in Spanish, too.
Please click on this worksheet about "los adjetivos" to download it at isl collective. You will need to create a free account to download worksheets on the website.