Learn English – Go over/through vs look over/through

I'd like to know the difference(s) between the verbs go over, go through, look over and look through.There are other words that have similar meaning to these verbs too but I chose to compare these verbs because they contains the same prepositions, which are over and through, so this is very confusing for learners.

Here are the definitions by Oxford Dictionary

Go over :Consider, examine, or check (something)

Go through :Search through or examine methodically

Look over : Inspect something with a view to establishing its merits

Look through : Peruse (a book or other written material)

What I observe is that dictionaries cluster their synonyms as search and examine.

I am familiar with the verb go over that is used to mean study before exams and I think the verb go through implies more detailed examination whereas look over means more like check out (appearance of something) quickly or superficially more than a office document which contains financial figures.

I read also these verbs may have an ambiguous meaning without a context but let's go over them.

Some examples from various dictionaries:

In the competition, the judge goes over each dog and assesses it.

Dave went through his pockets looking for the keys.

Customs officers went through all my bags.

Forensic ​scientists are going over the victim's ​flat in a ​search for ​clues about the ​murderer.

We're are still going over the ​details of the ​contract.

It's a good ​idea to get someone to go over ​your ​application ​form before you ​submit it.

Do you have a few minutes to look these samples over?

Students were given five minutes to look through the examination paper before they were told the start writing.