More than 2,000 of the 44,000 young people trying to get summer clerical jobs with Uncle Sam are still waiting for the results of tests that will enable them to go job hunting.

Because of a combination of computer errors and mistakes that applicants made in filling out forms, federal officials say, thousands of applicants still haven't received the results that most test-takers got earlier this month.

Civil Service Commission brass say the people involved in the snafu - including many applicants from the Washington area - should get test results next week by mail. That, CSC says, will still give the students time to compete for the 8,000-plus summer jobs at the clerk-typist level. Most of the students will be used as vacation replacements during the peak May-to-September leave period.

Federal agencies normally don't begin to select summer replacements until May 1. But this year, because of the test problems, the commission has told them to hold off hiring until everybody gets his or her test results.

If you, or somebody in your family, took the summer job test earlier this year and still don't have the rating results, they should be coming in sometime next week. If they arrive before May 1, the students will still have a good shot at getting a job. Bear in mind that at least 44,000 people were tested, that there are only about 8,000 jobs, and some of them will be filled by people who had them last summer.

Officials say that students who took the tests may apply now to the agency of their choice and inform it that the test results are coming soon.

Agency for International Development has given layoff notices to about a dozen of its foreign service staffers based here in Washington. The reduction in force (RIF) is part of an AID program to reduce its Washington staff of 2,300 and beef up its field force of 1,400.

AID is trying to cut another 200 Washington jobs and add another 100 to 200 jobs to overseas missions. During the RIF, the agency has been recruiting new people with special skills, while encouraging some employes who came on during the big Vietnam build-up to find other jobs or take early retirement, which is available through the end of May.

Officials say it is possible that jobs will be found for some or all of the dozen on the RIF list. But most who have gotten their walking papers are assuming that the firings will stand.

AID officials say the dismissals are not covered by President Carter's promise that nobody would be fired or demoted because of reorganizations. The no-firing pledge doesn't extend to "realignments", base closures or mission changes.

Workers at Defense and CIA employes who were canned in recent months also were excluded from the nobody-gets-hurt program of the White House.