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LOS ANGELES (CNS) - Dozens of students walked out of classes at  Jefferson Senior High School and staged a rally and sit-in Monday to protest  what they called troubles in class-scheduling that left them unable to attend  classes needed to graduate.

The students said the problems seemed to be exclusive to the Jefferson  campus, 1319 E. 41st St., and said the school's administrators were doing  little to fix the issues.

The students continued the rally until about midday, when they returned  to class. There were no reports of any troubles or arrests associated with the  sit-in.

Los Angeles Unified School District officials conceded that some  adjustments had been made to the ``master schedule'' last week, but the changes  were made ``in the best interests of students.''

``We learned that parts of the previous schedule were unacceptable: all  Advanced Placement classes were slotted in the same period, limiting students'  access to a college curriculum,'' according to LAUSD area superintendent Tommy  Chang. ``The same was true for core content classes for English Learners,  limiting their access to various subjects as all were scheduled at the same  time.''