Get a very high score or excellent results
To ace a test: Sean happily aced his math test.
You are very sure that you will be successful
To be in the bag: With such strong sales, the contract is in the bag.
A plan or project that suddenly goes wrong or fails
To blow up in your face: "Investing all her money in that tech startup was supposed to make her rich, but it blew up in her face when the company went bankrupt