Student or Learner
If we don't know the solutions, we might fail in exam.
(1) Is above sentence OK and natural?
(2) Do you consider "might" above a subjunctive?
(3) If the "might" above is a subjunctive, isn't the sentence strange in that the if-clause is a normal condition and the main clause is a subjunctive clause?
Fine, but the example needs a 'the' before 'exam'.