The highest single team's score is 443-9, which Sri Lanka scored against the Netherlands in 2006.
The highest combined scored is 872; Australia scored 434-4 against South Africa, who successfully chased it down with 438-9.
Well, if we talk about individual highest, it is 400 runs made by Brain Lara in test cricket. The highest total of a team in test cricket is 761.
Edit : The highest team score in Test cricket is in fact 952/6 by Sri Lanka against India, made in 1997 at R. Premadasa Stadium, Sri Lanka. Sanath Jayasuriya made 340 in that innings, and he scored a world record partnership for the second wicket with Roshan Mahanawa which is 576 runs. At the time it was also the highest record partnership for any wicket but later another pair of Sri Lankans, Mahela Jayawardene and Kumar Sangakkara extended that to 624 which was fro the 3rd wicket.
400* by Brian Lara of West Indies against England.
Sri Lanka's 443-9 against Netherlands.
south africa 438
188*
India made Highest score in ICC world cup matach against Bermuda.and the total score is 413/5
I
181 runs by Sir Viv Richards of West Indies in 1987 against Sri Lanka.
Final score of cricket world cup 2011 final match: Sri Lanka:274/6 India;277/4
The highest score achieved by a single team at the Cricket World Cup was 413-5, achieved by India against Bermuda at the 2007 competition.
sachind tendulkar
260/6 by Sri Lanka against Kenya in Johannesburg on 14 September 2007 during the ICC World 2020
Kenya
Sri Lanka scored the highest total in the 1992 Cricket World Cup. They scored 313 runs against Zimbabwe in the third match of 1992 Cricket World Cup.
mark waugh."australia"
338 and the match was a tie
Highest T20I score is 260-6 for Sri Lanka against Kenya in 2007 T20 World Cup in South Africa.