There are many countries which has affirmative action for certain communities i.e USA, China, Russia, Japan, South Africa, Brazil, Australia, Canada to name a few. And yeah India is such a great nation which takes care of their indigenous tribals and downtrodden communities.
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​Reservation of SC/ST are part of affirmative actions which are in existence since 1932, while OBC reservation is just added policy which provides equality measures in government jobs and education to certain communities with certain fix income criteria and it was implemented only after 1980.
Now talking of affirmative action we look at which country provides what equality measures to which communities.
India
In India affirmative actions are provided to Dalits and Adivasis who are termed as Schedule caste and Schedule Tribe.
United States of America
Canada
Japan
China
I can further go on and on to write about how different countries provides equal rights to their minorities, downtrodden communities and Tribals in different manner. Thus, its not only India.
Now in India Dalits are not given compulsory priority in private sector like US and Japan neither tribals are exempted from taxes and righteous to Jal, Jungle and Jamin like Canada and China. Neither SC/ST are provided free aid and housing like China and Japan. Thus, theirs nothing faulty in SC/ST reservation rather its hatred of General whom are unable to see Dalits and Tribals becoming somewhat equal by affirmative action rights which are provided to them and i am not generalising every uppercaste here but the one who loves to bark about reservation in midst of their hatred towards SC/ST.
The principle of equality sometimes requires States parties to take affirmative action in order to diminish or eliminate conditions which cause or help to perpetuate discrimination prohibited by the Covenant.

I think ,there is not any other country in the world have the caste based reservation
but like U.S. has affirmative action.
Affirmative action in the United States tends to focus on issues such as education and employment, specifically granting special consideration to racial minorities, Native Americans, and women who have been historically excluded groups in America.
Fundamental differences
There are at least five fundamental differences:
1. The affirmative action program and the ensuing preferential treatment in the U.S. is applicable to women too, in addition to disadvantaged races and ethnicity . In India, reservation is based only on castes.
2. In the U.S., fixing quotas or awarding preferential extra points is not allowed. This is a crucial difference from the Indian scenario where quotas are fixed. The U.S. Supreme Court in two historical judgments upheld the concept of considering race a factor in choosing candidates but unequivocally deemed unlawful fixing quotas or granting extra points for the disadvantaged groups. In 1978, in Regents of the University of California v. Bakke, 438 U.S. 912 (1978), the Supreme Court ruled in favour of racial preference for disadvantaged groups but struck down as unlawful the University Medical School's policy of reserving 18 per cent of the seats. In 2003, as cited by V.K. Natraj ("The reservation debate: missing components," The Hindu, May 27), the Supreme Court upheld as lawful the University of Michigan's policy of racial preference in law school admissions (Grutter v. Bollinger, 539 U.S.(2003)) because the programme furthered a compelling interest in obtaining "an educational benefit that flows from student body diversity." But it struck down as unlawful the university's policy of granting points based on race and ethnicity. Further, in the Presidential Directive issued to executive departments and agencies on July 19, 1995, the White House asked for elimination/reformation of any policy that (a) creates a quota; (b) creates preferences for unqualified individuals; (c) creates reverse discrimination; or (d) continues even after its equal opportunity purposes have been achieved.
3. In India, all political parties have been in favour of caste-based reservation. And constitutional amendments that are in contrast to judicial decisions have been made. In the U.S., judicial decisions serve as framework for implementing affirmative action policies.Further, in the U.S., individual states and university boards are free to legislate their own laws with respect to affirmative action in institutions that are within their scope. In 1995, Regents of the University of California voted to end affirmative action programmes on all its campuses. In 1996, California's Proposition 209 ended all public-sector affirmative action programmes in the state in employment, education and contracting though it permitted gender discrimination. In 2000, Florida banned affirmative action.
4. Another important difference is the requirement of institutions to "establish a process to review the effectiveness and fairness of affirmative action programmes on a continuing basis" - this requirement was communicated in the Presidential Directive dated July 19, 1995 as per the "decision in (1994) Adarand Constructors v. Pena (that) requires strict scrutiny of the justifications for, and provisions of, a broad range of existing race-based affirmative action programs ."
5. In the U.S., universities have taken upon themselves the onus of increasing the representation of disadvantaged groups (unlike universities in India where there is resistance). But even in the pre-2003 era when awarding preferential points was legal, U.S. universities usually awarded points only to as many individuals from disadvantaged groups as would be needed to beef up their population to their demographic proportion. For example, members from ethnic group A would be selected even if they scored lower SAT points but only if their open competition selection resulted in numbers lower than their population percentage. So if ethnic group A formed 9 per cent of the general population but formed only 4 per cent of the selected students, then SAT points for members of A were added in such a way that 5 per cent more students from A were selected.But in India, due to fixed quotas, people who belong to a reserved caste will get their reserved slots and also slots available in open competition.
source:- U.S. affirmative action & our reservation
some other countries have also some different quota but it is completely different from Indian reservation system.
Canada
Japan
China
What are others countries that have reservation systems like India?
No other country has reservation systems like India as we are the only country on earth where caste based discrimination exist.
Japan has castes, but are highly done away with after the meiji restoration.
Indian Castes and Feudal Japanese Classes
Japan's hidden caste of untouchables - BBC News
Other countries do have reservation system, but they ain’t anything like India, they are similar.
South Africa has racial reservation system :
South Africa introduces racial quotas for national team
Imposing racial quotas is a vital step forward for South African sport
Malaysia has bhumiputra scheme : Bumiputera (Malaysia) - Wikipedia
Brazil also has reservation system based on race in public universities of Higher education
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