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The inquiry-based teaching is known as one of the most active ways of teaching methods. It is closely linked to inquiry-based science teaching to enhance students' scientific capacities. This study aims to analyze the relationship between inquiry-based teaching approach and scientific achievement of Vietnamese students based on 2015 PISA database with a sample of 5826 Vietnamese students aged 15. The results show that teachers often use inquiry-based teaching method, the more scientific achievement of students increase. The study also provides some recommendations based on research results to improve the quality of science teaching method and students’ scientific capacity.

Computerized Adaptive Testing - CAT is a form of assessment test which requires fewer test questions to arrive at precise measurements of examinees' ability. One of the core technical components in building a CAT is mathematical algorithms which estimate examinee's ability and select the most appropriate test questions for those estimates. Those mathematical algorithms serve as a locomotive in operating the system of adaptive multiple-choice questions on computers.  Our research aims to develop essential mathematical algorithms to a computerised system of adaptive multiple-choice tests. We also build a question bank of 500 multiple-choice questions standardised by IRT theory with the difficulty level follows the normal distribution satisfying Kolmogorov-Smirnov test, to measure the mathematical ability of students in grade 10. The initial outcome of our experiment of the question bank shows: the question bank satisfies the requirements from a psychometric model and the constructed mathematical algorithms meets the criteria to apply in computerised adaptive testing.

This study aims to present an overview of researches on factors affecting the results of students learning foreign languages, especially English, from previous studies. The results of retrospective analysis of documents and studies have shown the gaps of research methods in analyzing the factors affecting English learning outcomes of students and recommended the use of structural equation modeling methods (SEM) to predict students English learning outcomes based on both subjective and objective factors.

Vietnam's financial investing market, especially the stock market, overcame the "Year of Covid-19" spectacularly with an exceptionally strong recovery, record-high liquidity, and the enthusiastic participation of new investors, surpassing all expectations. With the markets expanding fast, individual investors and financial advisors need to upgrade their understanding of the investing markets, and be ready to adapt to the