reg gdp L K edu
sca coef_edu=_b[edu]
mat SE=e(V) //save variance-covariance matrix of the estimators
sca se_edu=sqrt(SE[3,3]) //if you place -edu- the 2nd after the dependent variable, then change SE[3,3] to SE[2,2]
sca list coef_edu //here list the coefficient of -edu-
sca list se_edu //here list the SE of -edu-