In a country with such a large population, everyone ought to get an equal shot at things. Competitive exams can be a medium of giving equal opportunity to some, hence, it is used to distribute educational resources among students.
But, the students who come from backward classes and disadvantaged backgrounds, lack facilities and guidance, compared to students who can access good facilities such as coaching centres, personal tutors etc.
Therefore, the marks one scores should not be solely criteria. We need to assure everyone, irrespective of their gender, caste, religion or race, gets their rights. We should look at reservation as something which nurtures talent and includes more people.