Research the topic using as many different resources as possible. For example, read books, watch videos, conduct interviews and review statistics on the topic. Discuss the history of education with experts in the field and begin to narrow down your specific views on its failings and successes.
Pick an angle for your critique and stick with it. For example, if you decide to critique the history of education from a financial standpoint, you should do so from beginning to end. This will allow your critique to build on itself without distracting the audience or reader with a new approach. You could also approach this topic from an ideological standpoint, a theological standpoint or a political standpoint. Within these broad angles are several sub-concepts that can be the basis of your critique. For example, a sub-concept of a political standpoint may focus on the duties of the State in regard to education. The narrower your angle, the clearer your argument will be.
Use many specific examples of education throughout history to back up your critique. Include examples from each era of history you discuss. Examples will substantiate your overall conclusions by explaining exactly where and when the failings of education surfaced. Examples also help engage the audience with concrete concepts they can relate to rather than merely broad ideas.
Use a visual aid to further substantiate your claims. For example, if your critique is in the form of a presentation, use video clips from inner city schools that expose the poor conditions students endure. Or if your critique is in the written form, include graphs and charts that clearly display certain failings in the education system.
Propose a solution at the end of your critique and explain to the audience what they can do to help. It is important not to merely point out the failings of education throughout history and leave it at that, as that would make for a disappointing and dispassionate end to your critique.