I've heard some people use "helps" as the plural form of "help". Is that correct? Or are there any exceptions?
"Helps" is not commonly used as the plural form of help.
Places where we can use 'helps' is for 3rd person present tense.
Consider the following example:(taken from sentence.yourdictionary.com)
Howie is a very good guy who helps catch the bad ones.
Help can be used either as a verb or noun depending on the context, but not usually used as plural form.
There may be very few exceptions (source: Wiktionary)
help (usually uncountable, plural helps)
(usually uncountable) Something or someone which provides assistance with a task.
I've printed out a list of math helps.
The sense "people employed to help in the maintenance of a house" is usually an uncountable mass noun. A countable form - "a hired help", "two hired helps" - is attested, but now less common.
Hence except for study helps and house helps it is not used in other cases in general.
Saw "Helps" as a noun today. Saw in the Preface of "The New Standard Alphabetical Indexed Bible Holy Bible Authorized Or King James Version). (1963)(1969-70 Edition)