SC/ST QUOTA IN TECHNICAL EDUCATION

On one side the government says that they are against the differentiation on the basis of caste, color and creed and on the other side they give reservation to the SC/ST. THEY are differentiating between the general and the SC/ST, THEN after they complete their education then they also have quota in the GOVERNMENT JOBS .IS this not differentiation on the basis of the caste?.
The government should give reservation to the poor people, the orphans rather than giving reservation on the basis of the caste.