words and phrases about accuracy

On the money

A correct answer (one that could win prize money)

“Junko's calculation of the manufacturing costs for the new product was on the money.”

Dead on

Very accurate

“Ito-san was dead on in her assessment of the automotive industry.”

Right on and spot on are also used

Hit home

To make an strong impact with one's words

“Jun's remarks about wanting more fulfillment from her work really hit home with Ritsuko.”

On track

On target, on the correct course

“Kaoru is on track to be the first female managing director at her company.
”

Miss by a mile

To completely miss the target

“Hiroyuki underestimated the time required to complete the project and missed the deadline by a mile.”

A mile is roughly 1.6 kilometers.