Iron deficiency anemia (ADB) is anemia that arises due to reduced iron supply for erythropoiesis, due to empty iron stores (depleted iron stores) which ultimately results in reduced hemoglobin formation. This study aims to determine the effect of giving blood supplement tablets on HB levels in female students suffering from anemia at SMAN 1 Tambakboyo, Tuban Regency. The research design used a pre-experiment using a one group pre test post test approach, with a total sampling technique on a population of 34 female students suffering from anemia in class X and analyzed using the Wilcoxon test. The instruments in this research were Standard Operating Procedures (SOP), hemoglobin level observation sheets and Easy Touch GCU brand hemoglobin measuring equipment. The results of the study showed that the average HB level before 10.17 g/dl and after 15.46 g/dl given blood supplement tablets was normal. The results of the Wilcoxon test obtained a significant value of p=0.000 (p<0.05), which means that there was a significant difference in the HB levels of class X female students before and after being given blood supplement tablets. Health workers, especially in school health offices, should provide blood supplement tablets at the right time so that female students can take the blood supplement tablets regularly and finish them.

The purpose of this study was to determine the effect of E-learning-based collaborative learning in reducing students' misconceptions about class heat material. This study used a pre-experimental design with a one-group pretest-posttest design. The sampling technique used purposive sampling. The sample used was 300 grade XI high school students. Student misconceptions were analyzed using the CRI (Certainty of Response Index) method. The results showed that student misconceptions decreased by 26.50% from an average of 54.00% before learning to 27.50% after implementing E-learning-based collaborative learning. Based on the results of the hypothesis test, it can be concluded that e-learning-based collaborative learning has proven effective in reducing high school students' misconceptions regarding the concept of heat. The novelty of this study lies in the integration of cooperative learning with an e-learning platform that is specifically designed to reduce misconceptions about the idea of heat at the Senior High School.