Task 1 is tricky at the best of times but with more than one graph, it's even more interesting!!
You cannot report ALL the information - you have to choose the MAIN features and then compare the RELEVANT information.
from the Cambridge dictionary - relevant : correct or suitable for a particular purpose:
Watch this excellent video about TFNG or YNNG questions and the common misconceptions that students have about them.
Here are a few of my favourite resources!
Make sure you invest in reputable IELTS coursebooks and don't waste your money.