In Education:-

1) Increased Percentage of Marks to score, for students who don't fall in the general category.
2) Increased Student Suicide attempts because they cannot get into an elite college, inspite they have scored 99 % marks, because the seat is booked for a 60% guy.
3) Degraded standard of Students, in the Colleges.
4) Increased Bribe money being paid for seats, in colleges.
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In Govt. Jobs:-

1) The people who get into a Govt. Job with the help of reservation Quota, hardly know about the rules and regulations and they easily get influenced by the authorities because of their lack of knowledge.
2) No quality professionals want to work for the Govt., thus making the govt a bunch of Sick people.
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On Country:-

1) Politicians can always bank upon the reserved category for bloody votes, thus giving rise to "Politics on Caste/Reservation".
2) People start giving Bribe to govt. officials for getting their name registered in SC/ST/OBC categories.