April 15, 1990

LEAD: It seemed like old times on the takeover front. New deals aborning, old deals decaying - all in a week that ended on Friday the 13th.

LEAD: Black enrollment in colleges and universities reached record highs in the late 1980's largely because the schools developed extensive recruiting programs to tutor, counsel and provide financial aid to prospective students, educators and sociologists say.

LEAD: Fidel Castro called them ''worms,'' sexual perverts and criminals. The United States Government termed them ''excludable aliens'' and jailed hundreds of them for years with only the most minimal right of appeal.

LEAD: For more than 20 years without interruption, East Germany produced world-class athletes at a stunning pace, churning them out of a highly structured, state-run system that provided everything they needed, leaving nothing to chance.

LEAD: MORE than 400 federally subsidized apartments here are to be renovated and returned to the private market under a plan that, if it succeeds, could be copied elsewhere in the country.