4. nail down, nail, peg -- (succeed in obtaining a position; "He nailed down a spot at Harvard")
5. breeze through, ace, pass with flying colors, sweep through, sail through, nail -- (succeed at easily; "She sailed through her exams"; "You will pass with flying colors"; "She nailed her astrophysics course")
6. pinpoint, nail -- (locate exactly; "can you pinpoint the position of the enemy?"; "The chemists could not nail the identity of the chromosome")