心中有數

心中有数
xīnzhōngyǒushù
to know what's going on

CEDICT

to know very well in one's heart (e.g. what to do next, whether it is likely to succeed, etc.); to know the score

Wiktionary

對事情清楚明白而有把握。如：「瞎子吃餛飩，心中有數。」也作「胸中有數」。

重編國語辭典

對事情清楚明白而有把握

維基詞典

Entry Composition

1 心中 xīnzhōng
  1. central point
  2. in one's thoughts
  3. in one's heart
2 有數 yǒushù
  1. to have kept count; to know how many; (fig.) to know exactly how things stand; to know the score
  2. not many; only a few