Scoff if you will, employers say, but some teen-agers show up for summer job interviews with radios blaring from their pockets and five or six friends tagging along just for laughs.

Then there are those who went every Friday off so they can spend weekends at the beach, and others who don't want any job that starts before 9 a.m.

The openings are there, say county officials in charge of helping youths finds jobs, but teen-agers often are ill-prepared to enter the work force.

Job programs financed through the federal Comprehensive Employment Training Act -- CETA -- are required to provide job-orientation sessions for applicants.

Montgomery county has gone one step further by inaugurating seminars for filling the private-sector jobs.

"We're trying to teach kids how to survive in a summer jobs while keeping," the needs of the employer in mind," said Chuck Short, chief of the county's division on children and youth. "People have forgotten that employers have needs, too."

Each of the county's six regional youth service bureaus will schedule two-hour and four-hour seminars as prerequisites to county referrals for job interviews. The seminar dates have not been set yet.

"We have heard a great deal from employers that kids do not have the proper attitude or knowledge about work," said Dick Crane, who is coordinating the county seminars. "So we want to give the kids an orientation to the world of work -- how to fill out an application, how to appear for a job, what to look for in terms of taxes and wages, the attitudes of other, year-round employes . . .

"The ultimate benefit is for the child, but we want to assure the employer there has been some attempt to give the kids an idea of what is going to be expected from them."

The two-hour seminar is for youths seeking personal services jobs, such as lawn-mowing or window-washing. The four-hour session is for those looking for full-time summer employment. The program generally is for youths ages 14 to 18.

Sherry Smith, a youth employment services planner for Prince George's, said the county is considering a seminar program silimar to Montgomery's but thus far has been hampered by lack of facilities for the training sessions, and of cross-country public transportation.