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The changing times that followed the development of technology made the education system management must be updated to suit the needs and conditions of the environment. In this article, we look for information about the education system in two different countries, namely Japan and Indonesia. The purpose of this research is to find out the integration between the two countries that have different education management systems. The research method used is a descriptive qualitative method. In this research also, the research method is based on the philosophy of postpositivism, using natural conditions or objects. The instrument used to find out information on the education system in each school uses 10 questions and looks for curriculum information data in general in each country. The findings in this study found that, although the management of the education systems of the two countries was slightly different, Indonesian students could compete to continue their tertiary education to developed countries. Besides, the education system in Japan does not make students from Indonesia experience difficulties.

This article discusses the readiness of Islamic tertiary institutions in facing the digital era. This article is written based on field research with a qualitative method of evaluating gap models. The Kediri State Islamic Institute (IAIN) and the Kediri Tribakti Islamic Institute (IAIT) were selected as research locations. The results of this study indicate that the readiness of IAIN Kediri in facing the digital era is still not optimal. Likewise, with the readiness of IAIT, where the leadership's support in facing the digital era is hampered by limited abilities. The competence of the IAIN Kediri lecturers in delivering lectures online is quite good. Likewise, the competence of IAIT Kediri lecturers in delivering lectures online is still relatively low. Infrastructure readiness at IAIN Kediri to support education in the Digital Age is good, but not yet fully available. Meanwhile the infrastructure readiness at IAIT Kediri is also quite good, but needs various improvements. It takes synergy and collaboration from all elements of Higher Education in facing the demands of the digital age.

The numerical ability of students needs to be mastered because it relates to speed and accuracy in using basic functions in calculating basic mathematical operations. This study aims to determine the impact of the Group Investigation (GI) learning model on numerical ability. The research method used is Quasi Experimental using a quantitative approach. The instrument used in the form of essay test questions. The data used are the results of the post-test analysed with T test. Based on the data obtained Tcount = 5,849 and Ttable = 2,005 because Tcount ≥ Ttable it means that the numerical ability of students taught with GI learning model is better than the numerical ability of students who were given conventional learning model so it can be concluded that, Group Investigation (GI) learning model has a good impact on students’ numerical ability.

This study is a development research that aims to find out how the results of the development of problem-based Student Worksheets to improve students' mathematical communication skills and self-efficacy. This research was started from a preliminary study, Student Worksheets preparation, Student Worksheets validation, initial field trials, and field trials. The subjects of this study were students of Junior High Islamic School MTs Negeri 2 Bandar Lampung in the 2015/2016 academic period with a total of 120 students with heterogeneous mathematical abilities. Research data were obtained through mathematical communication tests and self-efficacy scales. The effectiveness test was conducted to determine the effect of Student Worksheets on mathematical communication skills and attitude analysis was carried out to determine the tendency of students' self-efficacy. The results of the preliminary study indicate the need to develop a problem-based Student Worksheet. Preparation of Student Worksheets begins by preparing a Student Worksheet and all its components based on the Student Worksheets preparation guidelines. The validation results show that the Student Worksheet has met the standards for content, suitability and design. Field trial results show that Student Worksheet is included in the good category. Field test results show that the aspect of students' mathematical communication is quite good because more than 75% of students have met the minimum completeness criteria and Self-efficacy of students tends not yet to show changes.