The article analyzes the forms and methods of knowledge check of international students at the stage of pre-university training, and their impact on the effectiveness of educational activities at the Chair of Chemistry and Biology of the Department of Russian Language and General Disciplines at the Peoples' Friendship University of Russia. The authors discuss the features of the use of oral and written forms of knowledge check, testing, as well as the feasibility of their use at each stage of the study of chemistry. Written check test is the most objective and accurate method to assess knowledge in chemistry, but the poor command of the subject language limits its use in the international students’ audience. The oral testing contributes to improvement of language and speech skills of students, assimilation of lexical and grammatical constructions, and expansion of professional vocabulary. Testing is the most convenient form of knowledge assessment in international audience because it helps student and teacher to overcome the language barrier separating them. The article describes the advantages of conducting check using a computer-based form. It is noted that for international students, who learn Russian in parallel with other disciplines, constant monitoring of the quality of learning material is a prerequisite to achieving success in the educational process. © 2019, Institute of Advanced Scientific Research, Inc. All rights reserved.