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This century demands that everyone has 21st-century skills. The Covid-19 pandemic era has an impact on education, however, to face the global era, 21st-century skills must still develop in higher education including 21st-century learning skills called 4C skills (Creative, Critical, Collaboration, Communication). The survey of results on students participating in the Mechanics I course shows that creative and critical thinking skills are in a low category, collaboration and communication skills are also in the low category. This study aims to develop 4C skills in the pandemic era through learning Physics in Mechanics course with a Science Technology Engineering and Mathematics (STEM) approach, assisted by Scratch, and to know students’ responses to the applied learning. The research subjects were students in the third semester, who took the Mechanics I course as many as 110 people and were divided into three groups. The research method is a quasi-experiment one-group pretest-posttest design. The research instrument consists of essay tests to measure creative and critical thinking skills and observation sheets to measure collaboration and communication skills. The results of data analysis demonstrated that students' 4C skills increased, the average is in the medium category.

This study aims to describe STEM-based Student Worksheets, which facilitate the development of critical and creative thinking skills. Another aim is to test the level of readability, feasibility, and describe the improvement of critical and creative thinking skills after the Student Worksheet is applied. This research uses Research and Development (R&D) method as well as one-group pretest-posttest design. As research subjects were ten high schools in the city of Semarang. The results of the feasibility test indicate the criteria are suitable for learning by obtaining an average of 88.96% which means it is very feasible. In addition, the readability test showed that the worksheets were easily understood with an average of 91.66% and an analysis of improvement in critical and creative thinking skills was found to have high average criteria.

This research aims to know where is the mistake of students on the tests of the ability of mathematical creative thinking in terms of the ability of mathematical resilience. The subject taken in this research that is grade VIII-A of MTs Fatahillah Cimahi consists of 26 students. This research used descriptive methods with qualitative and quantitative data analysis. Stages of the research done with 4 stages: filling the quisioner mathematical resilience, mathematical creative thinking ability test, data analysis and concluded. The results of this research were obtained: 1) students with high level of ability of mathematical resilience made a mistake at the indicator of original thinking skills (originality) and fluent thinking skills (fluency), 2) students with medium level of ability of mathematical resilience made a mistake at the indicator of detailed thinking skills (elaboration), 3) students with low level of ability of mathematical resilience made a mistake at the indicator of original thinking skills (originality), fluent thinking skills (fluency) and detailed thinking skills (elaboration).

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