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21st-century globalization era requires citizens to have 21st-century skills (4Cs; critical and creative thinking, collaboration, and communication) in supporting their job competencies. The government recommends learning process being emphasized by 21st-century skills (KA21) training. This study aims to get KA21 overview of high school students using 221 samples, randomly obtained from 288 students at one of the high schools in West Bandung district. The study focuses on observing behaviors trained by KA21 in physics learning through project-making. Observation results represent that critical thinking skill can be built at 67.88% and creative thinking skill reaches 66.48%. The involvement of teachers is still quite dominant in directing the steps to develop and complete projects. Collaborative skill reaches 76.21%, as well as communication skill that can be built at 79.06%. Teachers still have to dominantly ask students to read and present the project results. Thoughtful steps need to be developed in training KA21. Teachers have to ensure that students have sufficient knowledge. All students have to be actively involved in teamwork and know how to work in team. Generating creative ideas need to be exemplified by teachers. Virtual classes can be given to overcome unfinished learning at class because of insufficient time.