IMPROVE your English by...

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... PRACTISING your GRAMMAR :

>>>  Grammar exercises  
>>>  grammar quizzes, from beginning to advanced levels

>>>   Quizzes on the BBC site 
>>>   MCQ : Present perfect or past simple/preterite ?

                                                                          An MCQ is a test that includes Multiple Choice Questions.

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... PRACTISING irregular VERBS

-did I hear "Ouch !" ?

Actually there are no other solutions than learning them by heart.
You all have a list of these verbs in your textbook : such lists
are often at the end of the textbook.
Here is an IRREGULAR VERBS  BASIC LIST   

click on the PDF logo ^^^
with different groups of verbs, according to their changes.

This list is quite a "basic" one : it includes only the most common verbs,
   the verbs you MUST absolutely know.

My "Here is a basic list" means... you must regularly  brush up  <<<
on many other verbs  :o)