[Question] What are the advantages and disadvantages of knowing your own IQ?

I’ve seen some an­swers here: https://​​www.quora.com/​​What-are-the-ad­van­tages-dis­ad­van­tages-to-know-your-own-IQ

But I would be cu­ri­ous to know the per­spec­tive from peo­ple here.

Third al­ter­na­tive: tak­ing an IQ test and track­ing your IQ, but not look­ing at it.

For ex­am­ple: Can track­ing IQ be use­ful to track cog­ni­tive degra­da­tion and pre­dict neu­rode­gen­er­a­tive dis­eases?