linking ambition to quotations in Macbeth
To remember all the quotations you need for your exam when the theme is ambition use the following mnemonic:
First, create a key image for ambition. One way to remember ambition is the mnemonic, "to climb a ladder".

Now create a single rememberable image for each of the quotations in Macbeth that relate to ambition. As a first stage we will reference three quotations.
Quote 1 - Ambition
"I have no spur to prick the sides of my intent, but only vaulting ambition". This quotation highlights how Macbeth's uncontrolled ambition drives him.
This quotation can be remembered with a single picture mnemonic of a horses spur:

Quote 2 - Ambition
"Stars, hide your fires, let not light see my black and deep desires". A quotation where Macbeth acknowledges that his ambitions are dark and evil.
This quotation can be remembered with one single picture mnemonic of a star:

Quotations 3 - Ambition
"Come, you spirits that tend on mortal thoughts, unsex me here". This demonstrates the willingness to sacrifice humanity for ambition.
This quotation can be remembered with the single picture mnemonic of a beckoning spirits over:

Now link all of the above images together
Link AMBITION to spur, to stars, to come you spirits.
She climbs the ladder of ambition and you can hear her from the clanking of the horse spurs she is wearing.

When she reaches the top of the ladder she climbs up into one of the stars.

As she stands on the star she beckons over spirits.

You now have three quotes from your stock of quotations you learnt that are linked to ambition.
If you want more you can extend the story.