difference between "pool" and "collect"

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English Language Proficiency Tests, Advanced Level

ESL/EFL Test #809 "Juneteenth, a holiday in the United States", question 7

All over Texas, freed slaves ......... their money to buy land for their increasingly large Juneteenth festivities.

(a) collated
(b) remaindered
(c) pooled

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #809 "Juneteenth, a holiday in the United States", answer 7

All over Texas, freed slaves pooled their money to buy land for their increasingly large Juneteenth festivities.

Correct answer: (c) pooled

Your answer was: incorrect
All over Texas, freed slaves collated their money to buy land for their increasingly large Juneteenth festivities.
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Good morning.
I don't understand the slight difference between "pool" and "collect". Both of them seem to have the same meaning.
Thank you in advance
Mik

[Beeesneees]

to pool something - to put it together... to join everyone's amount/resources together.
to collect something - to gather it together... to get an amount/resources from everyone.

In this context both of those words are appropriate. This is presumably why 'collect' is NOT one of the question options.
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Terry Pratchett