STEM (science, technology, engineering, and math) was developed to answer challenges in the 21st century; where students are not only smart in terms of cognitive, but also skilled. STEM in education has the aim of preparing students to be competitive and ready to work according to their preferred fields. The benefits of applying STEM Education are to improve critical thinking skills and be creative, logical, innovative, productive and directly related to real conditions. The purpose of this study is to review the implementation of STEM Education models in the early 21st century. Technique of collecting data was through literature study. The results of this study: 1) STEM has been applied in various countries and in various branches of science; 2) History of STEM Education, 3) Implementation of STEM in non western country, 4) Skill that required in 21st century, 5) STEM to face 21st challenge.

This is a development research to produce valid and practice Student Worksheet. This research used 3 steps from 4-D models those are defined, design and development. The subject of this research was 28 students class X from SMA Negeri 1 Padang, validated by 2 lecturers and 2 teachers. The object of this research was based student worksheet that validated by 4 validators. The data in this research are primary data consisting of validity and practicality. The result of validity was 87,30% with criteria valid, practicality by teachers was very practiced with value 85,94% and by the student was practicing with value 83,05%.

Curriculum occupies a central position in education. Curriculum changes guided by the times and technology. The main problems of implementation of curriculum change is to change the mindset of teachers. Prospective teachers should have high order thinking skills to face the times and technology. One of efforts could be made a lecturer for conditioning of learning to be able to develop higher order thinking skills of students by using the right assessment. One assessment that play a role in increasing the skills of thinking is portfolio assessment. This study aims to describe the increase in high order thinking skills of students applying portfolio assessment. This research is a classroom action research conducted on students who take courses in curriculum and biology textbook in biology Faculty UNP in the July to December semester of 2017. The results showed an increase in high order thinking skills of students using portfolio assessment.

Teaching and learning activities are the most basic activities in the entire educational process. The success of learning itself depends on the use of the selected learning resources. Based on the results of the observation questionnaire learning sources in the form of textbooks, student worksheets (LKPD), PPT slides and modules are available and used in schools, but additional learning resources are still needed because the learning resources used have not been able to attract interest and increase student learning motivation . Based on this, a product was developed in the form of a booklet on material for class X SMA students that was valid and practical. The average result of the booklet validity value is 86.45% with very valid criteria with a description of 84.25% in the content feasibility aspect, 88.33% in the linguistic aspect, 86.11% in the presentation aspect, and 87.50% in the the graphic aspect. The conclusion of the research that has been done is the development of booklets on bacterial material for class X SMA students fulfills the very valid category and is very suitable for use as a learning resource.

STEM literacy in education aims to be able to prepare students to be able to compete in the world of education in the world of work in the future. The benefit of STEM Literacy is that it makes students more skilled in all areas including science, technology, mathematics, and engineering. In ad- dition, STEM literacy can also make students improve their critical thinking skills and become crea- tive, logical, innovative, productive and relate directly to real conditions. This study aims to analyze the needs of students' STEM literacy achievement assessment in learning biology. The type of research used is descriptive, with data collection techniques carried out by conducting observations and inter- views. The results showed that biology learning has been implemented based on STEM literacy, stu- dents are still less enthusiastic in reading, students are more interested in learning related to technol- ogy, teachers do not know the assessment of students' STEM literacy achievement in biology learning.