21st Century Skills are such essential skills to be prepared for professionalism needed nowadays. Therefore, education curricula were more emphasizing to exercise these skills. To achieve this objective, we have to build a standard assessment test to make sure that students have accomplished these skills. This research attempted developing a set of 21st-century skills tests tested to some teachers in Jawa Barat with a sample of 45 teachers. The problems presented refer to the design standardized by the National Assessment of Educational Progress (NAEP). The test consisted of 10 concept comprehension questions and 16 21st-century skills problems with the rubric developed by Suzie Boss. The test was designed using Edmodo and Moodle platforms. The research result showed that the concept comprehension test has high validity, 0.628. As the 21st-century skills test, there are some problems not validated. Therefore, some issues on this proposed standard test should be further improved.

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