English irregular verbs are not really as difficult as you think. It is something you can solve if you take some time. As you know we study irregular verbs in three columns: the first one is the infinitive (base form) the second one is the past simple and the third one is the past participle.
You can find some exercises below:
http://mrc.ltd.free.fr/preterit.htm
http://www.english-4u.de/iv_quiz1.htm
http://suz.deutsch-digital.de/english/grammar/verbsa.htm?docbase=http://suz.deutsch-
digital.de/english/grammar/index.php
http://www.pumpkinandcompany.com/PAC/Kids-activ-games_Gquiz3e_PastSimple1.htm
http://www.bradleys-english-school.com/online/concentration/past1.html
http://www.kico4u.de/english/uebungen/aktiv/simplepast1.htm
You also must click on videos (irregular verbs) to learn the pronunciation.
