Are you ready for a new challenge!!
First of all, it is very important to learn and practise the past participle of irregular verbs. So let´s begin with that. Here you have some links for you to study.
LEARNING IRREGULAR VERBS PAST PARTICIPLES
ISL COLLECTIVE PAST PARTICIPLES
PRESENT PERFECT I
WHEN TO USE PRESENT PERFECT WITH EXAMPLES
BEST EXAMPLES OF PRESENT PERFECT