Issues in Malaysian education

Language
The issue of language and schools is a key issue for many political groups in Malaysia. UMNO championed the cause of Malay usage in schools but private schools using the Chinese and Tamil language are allowed. Up until 1981 in Peninsular Malaysia (and some years later in Sarawak), there were also English-medium schools, set up by Christian missions. However, following the severe race riots in Kuala Lumpur in May 1969, English-medium schools were phased out from January 1970, so that by 1982 these became Malay-medium schools (‘national schools’).
The existence of vernacular schools is used by non-Malays components of the ruling Barisan Nasional to indicate that their culture and identity have not been infringed upon by the Malay people. This is often a key issue as it is considered important by many. Dong Jiao Zhong (the association of Chinese vernacular school boards and teachers) and other such organizations still shape much of the views of the Chinese educated community, which is a key electoral constituency.
In 2002, the government announced that from 2003 onwards, the teaching of Science and Mathematics would be done in English, in order to ensure that Malaysia will not be left behind in a world that was rapidly becoming globalised. This paved the way for the establishment of mixed-medium education. However, the policy was heavily criticized especially by Malay linguists and activists, fearing that the policy might erode the usage of Malay language in science and mathematics, which led to a massive rally in Kuala Lumpur on 7 March 2009.[14] The government announced however this policy will be reversed in 2012, where the teaching of both subjects would be reverted back to Bahasa Melayu.[15]
Due to the lack of Chinese students attending government schools, coupled with the number of non-Chinese students attending Chinese vernacular schools, the government announced in April 2005 that all national schools will begin teaching Chinese and Tamil, not as a mother tongue course but as an elective course.

taken from here