Allan Bakke, the 38-year-old engineer whose name has become a symbol of conflict over school admissions and race, entered the University of California Medical School yesterday unnoticed by about 100 demonstrators, some chanting, "Smash the Bakke decision now."

Bakke, who is white, started classes at the university's Davis campus under a U.S. Supreme Court order that struck down the school's preferential admissions program for minorities.

The court ruled 5 to 4 that the program, which reserved 16 places in each class of 100 for low-income minorities, violated federal laws barring racial bias in government-supported education. Bakke had applied unsuccessfully for admissions in 1973 and 1974.

River, Mass., 14 teachers were arrested while picketing a school committee member's home and charged with unlawful assembly and disorderly conduct.

About 260 teachers in Bridgeport, jailed for refusing a court order to end their 19-day strike, ratified a new contract and were set free to begin teaching the district's 23,000 students. The 1,450 teachers in the nine-school city colleges of Chicago system voted to return to the classrooms pending a formal ratification vote later this week.But at least some of the Chicago teachers were unhappy with the proposed contract that provides 5 percent raises this year and next.