Just in case there are questions on visual documents (pictures, graphs, paintings and goodness knows what else), this 2nd video may be helpful to get an overview of such analyses.
The method on PDF, you were looking for :
A method to interpret paintings or graphs in case you have that in the bac :
Another doc. about understanding instructions (kind of old but still helpful) :
Make sure to check your level in reading with this simple test
Now, if this is not enough, here are some links.