Penelitian ini bertujuan untuk mengetahui apakah dengan penerapan pendekatan inquiri fisika akan meningkatkan hasil belajar siswa Kelas XII MIPA 1 Semester Ganjil Tahun Pelajaran 2019/2020 pada SMA Negeri 3 Kotabumi Lampung Utara. Metode yang digunakan dalam penelitian ini adalah Penelitian Tindakan Kelas yang di lakukan dalam dua  siklus, setiap siklus terdiri atas perencanaan, tindakan, pengamatan, dan refleksi. Tehnik pengumpulan data yang di gunakan yaitu, observasi, wawancara, tes, fhoto, dan dokumen.   Hasil perbaikan tindakan yang dilakukan oleh guru dari Siklus I ke Siklus II, ketuntasan belajar siswa meningkat dari 22% menjadi 100%, sedangkan untuk nilai rata-rata juga meningkat dari 75,34 menjadi 85,60. Ini menunjukkan bahwa pelaksanaan KBM dengan metode inquiri sangat efektif untuk meningkatkan hasil belajar siswa.

SMA Negeri 3 Kotabumi as an educational institution has the problem of still low student learning outcomes in Economics. Student learning outcomes in economic subjects, especially students of class X IPS 2 are still low. Determination of learning strategies in order to improve the quality of the process and learning outcomes can be investigated by classroom action research, because this study aims to overcome problems or solve problems in the classroom by taking action. One of the cooperative learning techniques is the Jigsaw technique. By implementing Cooperative Learning procedures correctly, it will be able to activate students so that they can improve student learning outcomes Classroom Action Research (CAR) is designed as a study material in the application of learning "Jigsaw" models to improve the ability to solve statistical problems in Economics. This class action research was conducted on students of class X IPS 2 of SMA Negeri 3 Kotabumi in the odd semester of 2018/2019, with 32 students consisting of 15 boys and 17 girls. This research has the benefit of increasing the ability of students to understand economics in this case students are trained to dare to express opinions or differ opinions on issues of presenting data. Learning with the jigsaw model can be presented to improve the ability to understand statistics in Economics. The study design was carried out in two cycles, starting with planning, implementing actions, observing, reflecting, and continuing with the next planning cycle. This research took place in September 2018 until November 2018. Based on the results of the study it was concluded that the Jigsaw model was able to improve the learning outcomes of Economics in class X IPS 2 students of SMA Negeri 3 Kotabumi in the academic year 2018/2019.

Based on observations and experiences in class, it was found that writing is often a matter of less interest and there is less good response from students. Writing skills in the classroom are generally taught only when learning to write, writing skills should be integrated in learning or inserted in every learning in class. Problems that also arise related to learning writing skills in schools are the way to assess and target curriculum achievement which is only measured based on the results of written tests. Because of this, it is necessary to apply an authentic writing skills assessment model that is in accordance with various techniques and procedures. The subjects in this research were the process of teaching and learning activities between students and teachers / researchers of Class XII MIPA 1 of SMAN 3 Kotabumi, North Lampung Regency in the Academic Year of 2017 - 2018, amounting to 34 students. After conducting research and analyzing research data, the researchers concluded that the use of journal writing skills as an authentic assessment material in Indonesian Language Subjects Class XII MIPA 1 SMA Negeri 3 Kotabumi can improve student learning outcomes. This is evidenced by the increase in the percentage of Minimum Completeness Criteria that have been determined from the first cycle to the second cycle of 23.69%.