My yucca leaves are yellow nothings wrong with the core and its soil is dry when i water it help?

Is it potted?

It may have outgrown the pot and become "root-bound".

If so, you could need to either plant it in a larger pot or in the ground. You would also have to separate and "fluff" up the roots and maybe snip a few of them to allow quicker flow if water and nutrients.