The sentence "students were concentrated" is correct and usable in written English
You can use it when describing a situation where a group of students were paying close attention to something. For example: "The students were concentrated, carefully listening to the professor's explanation of the lesson."
Those students were "concentrated in single locations for long hours in jobs that provided little or no opportunity to interact with U.S. citizens," the department wrote to explain the rules.
During this year the students were concentrated in the production of songs.
The students were concentrated in West Bengal (24/79, 30%), Orissa (9/79, 11%) and Himachal Pradesh (9/79, 11%) where the programme became popular among public health officials.
Most of the other districts, some with only a few students, are concentrated in eastern Suffolk County.
The increase in high-scoring students was concentrated in the middle- and upper-middle-class districts of Manhattan and Queens.
A boom in university participation in recent years has led to a more diverse student body, but black students are concentrated in a handful of institutions.
Most educators believe that these programs are needed to achieve higher standards in urban districts where low-income students are concentrated.
Because the vast majority of college students are concentrated in the humanities– not math and science– there should be a significant opportunity for Cramster to capture that market.
These results suggest that the negative LE share effects on black students are concentrated both at the top and the bottom of the achievement distribution within the school.
The majority of students are concentrated on Oxford Road in Manchester, Europe's largest urban higher education precinct.
The study used indicators of funding levels, funding distribution, effort and coverage to examine the effects of a decentralized and increasingly segregated education system that has led to more and more poor students being concentrated in high-poverty school districts.
