Related Clues:

• Works over
• Works on, as a budget
• Tinkers with
• Studies all night
• Pulls an all-nighter, say
• Shoves (in)
• Alters
• Works on, as a novel
• Stuffs tightly
• Studies intensely
• Overpacks
• Checks, reviews
• Prepares for exam with hasty and intensive learning
• Jam-packs
• Is a quick learner?