How to say they studied very hard so as not to fail in the exam. in Japanese
1)
彼ら彼ら(karera) (n,adj-no) those/theyはは(ha) (int) indicating a subject/yes/indeed/well/ha!/what?/huh?/sigh試験試験(shiken) (n,vs) examination/test/study/trial/experimentにに(ni) (prt) indicates such things as location of person or thing, location of short-term action, etc.失敗失敗(shippai) (n,adj-no,vs) failure/mistake/blunderし(num) 10^24/septillion/quadrillionないよう(n) subject/contents/matter/substance/detail/importにに(ni) (prt) indicates such things as location of person or thing, location of short-term action, etc.懸命no dictionary result, likely a conjigated verbno dictionary result, likely a conjigated verbにに(ni) (prt) indicates such things as location of person or thing, location of short-term action, etc.勉強勉強(benkyou) (n,vs) study/diligence/discount/reductionしたした(shita) (n) did/a past form of the previous verb/tongue/tongue-like object/clapper/talon。。(。) Japanese period "."
