How was the planet Jupiter made?

It is not known.

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While it's true thre are mysteries (and the site given above is 6 years old) the following site may help you to get the assignment done.
http://juno.wisc.edu/science_history.html

To understand how the planet Jupiter was made, scientists study the formation of the entire solar system. However, the exact process of how Jupiter specifically formed is still a topic of study and research, and not all details are known yet.

To get a more comprehensive understanding of the formation of Jupiter, you can refer to scientific research papers, scholarly articles, and books by experts in the field of planetary formation. These sources will provide you with the latest information on theories and hypotheses about Jupiter's formation.

One reliable and up-to-date source of information is the website of NASA's Juno mission (https://www.nasa.gov/mission_pages/juno/main/index.html), which explores Jupiter's origins, structure, and composition. This website offers valuable insights and resources related to the planet's formation.

Additionally, you can access academic databases, such as JSTOR or Google Scholar, to find peer-reviewed articles and scientific papers on the topic. These sources will provide you with detailed explanations and research findings related to the formation of Jupiter.

Remember, scientific knowledge is continually evolving, so be sure to check for the most recent and reliable sources of information on this topic.