The highest team score in Test cricket is 952 for 6 declared, achieved by Sri Lanka against India at the R. Premadasa Stadium in Colombo from August 2 to 6, 1997. This monumental innings featured a record-breaking partnership of 576 runs between Sanath Jayasuriya (340) and Roshan Mahanama (225).
Other notable high team scores in Test cricket include:
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England: 903 for 7 declared against Australia at The Oval, London, in August 1938.
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England: 849 all out against West Indies at Sabina Park, Kingston, in April 1930. ESPNcricinfo
These extraordinary totals underscore the dominance of batting sides in particular matches, often influenced by favorable pitch conditions and exceptional individual performances.