Where can I find online english exercises and exams to test my grammar and vocabulary knowledge?

All the responses here are good. If you wish to go for an advanced standard, go for TOEFL / IELTS practice tests.

You can go to iversity.org to check for free english courses. You can also go to youtube.com to find lessons and tests.

You can check myenglishpages.com

or testden.com

https://www.anglo-link.com/index.php?%2Fenglish_test%2Fbeginner_test

http://www.englishjet.com/

http://learnenglishteens.britishcouncil.org/ar/exams/grammar-and-vocabulary-exams/grammar-and-vocabulary-exams

http://www.examenglish.com/leveltest/grammar_level_test.htm

http://www.english-test.net/esl/learn/english/grammar/ii154/esl-test.php

http://www.myenglishpages.com/site_php_files/exercises.php

http://a4esl.org/q/j/tp/mc-placement.html

I think duolingo.com Have many nice exercises

http://www.englisch-hilfen.de/en/

http://www.englishgrammar.org/exercises/

Read:

http://www.examenglish.com/leveltest/grammar_level_test.htm

Sorry! You need to surf the Internet; you may find an answer to your question, because I don't have! 

Thanks for the invite apologized for the answer I do not know, I leave the answer for the professionals

There are so many sites online now. Most have a free membership option as well. You can find tests and lessons fron Preschool to College level.

Basm allah alrahman alrahim

 

Strong answers and nothing to add