Focus, center, rivet, attend, or "pore over". For gathering: Accumulate, amass, congregate, or cluster.
Example: "I need to concentrate on my work to finish this report". concentrate
Condense, distill, intensify, or "boil down". Tips for Better Concentration Focus, center, rivet, attend, or "pore over"
To bring or gather things together in one place or toward a common center. or "pore over". For gathering: Accumulate
If you are looking to improve your personal focus, research-backed strategies include: Tips to improve concentration - Harvard Health
To direct one’s full attention and effort toward a specific task or problem.