Studying biology serves as a means to enhance understanding, abilities, perspectives, principles, and ecological accountability. Biology is the scientific discipline that seeks to understand the natural world. Learning biology entails more than simply acquiring factual knowledge, concepts, or principles; it is also an exploratory endeavor. This research aims to discuss problem-based learning (PBL), which can improve the learning outcomes of class XI biology students on plant tissue material and can be used as an alternative learning model. This research uses classroom action research (PTK), which includes four stages: planning, implementing actions, observation,  and reflection, which aim to improve the learning process. PTK is an activity that involves testing an idea in practice, which can improve and increase the quality of the teaching and learning process. The application of the PBL model was able to improve student learning outcomes, especially in biology subjects with plant tissue material for class XI students at SMA N 2 Langowan. During the pre-cycle, the average value was 5.7. In cycle I, it climbed to an average value of 7.3. In cycle II, it further increased to an average value of 8.4. Meanwhile, the completeness of student learning outcomes in the pre-cycle was 20%, while in the first cycle, it was 67%, then grew again in the second cycle, specifically 87%. Based on the aforementioned research findings, it can be inferred that the implementation of the Problem-Based Learning (PBL) model has led to an improvement in the academic performance of Biology students at SMAN 2 Langowan.
 

This study seeks to ascertain the extent of student discipline in relation to their study habits and examine its impact on enhancing student academic performance. The research methodology employs a correlational design to ascertain the correlation between discipline and study habits in order to enhance the academic performance of class XII students at SMA Negeri 2 Tondano. The population consisted of 46 pupils, and the sample was obtained by a random sampling procedure or by random selection. Random sampling is a technique for selecting samples in a random manner, ensuring that every member of the population has an equal chance of being chosen. The sample size in this study comprised 30 students. The findings of the research, which employed descriptive statistical analysis, indicate that the mean student discipline score is 33.13, the student study habits score is 30.43, and the mean student learning score is 90.6. The research findings, obtained through the use of Pearson product-moment correlation, indicate that the value of rcount is greater than rtable for a sample size of 30, specifically 0.394. If rcount > rtable, it indicates that discipline has an impact on the study habits and learning outcomes of class XII students at SMA Negeri 2 Tondano. If the count of r (rcount) is greater than the count of r in the table (rtable), the null hypothesis (HO) is rejected and the alternative hypothesis (H1) is accepted, according to the proposed research hypothesis. Discipline exerts a substantial impact on the study habits and academic achievements of twelfth-grade students at SMA Negeri 2 Tondano.