The tragic plight of school-aged black boys has been well studied and documented by various scholarly groups, such as the advisory committee appointed by the Prince George's County public school superintendent, as reported by William Raspberry {op-ed, Aug. 26}. The main cause of poor academic performance of black boys, relative to other groups and black girls in identical public school environments, is, to me, obvious, and pointed out in Mr. Raspberry 's column. Too many black boys mistakenly ''learn'' how to be young black men from their ''peers'' in the streets, thus erroneously equating academic exertion with ''acting white'' and manhood with the ability to fare well physically rather than intellectually.

I propose a direct remedy for this dilemma in the schools, where intellectual ambitions are fostered and nurtured. Classes especially targeted to black boys should be established to teach how black men have climbed to positions of great achievement. Most such men at some point in their lives were academic scholars in higher education.

The candidate list is long. Frederick Douglass, Martin Luther King Jr., Doug Wilder and Jesse Jackson come immediately to mind. Surely, this is within the scope of public school responsibility, and surely the cost would be minimal. I suspect young black males would sign up for such classes en masse and their interest would lead to high attention and subject material retention. A black man as teacher would round off a stimulating and successful experience in intellectual achievement many youths sorely need.

W. C. MANGUM Alexandria