Our work is based on a mathematics test which the students accomplished, interviews with student and teachers who are working on this program and the current literatures. The purposes of this work are to search the importance and the effect of the languages understanding in students learning of mathematic in the Individual high school curriculum. In total, sex students and three teachers took part in our study. Tow of the students is mother tongue language student and the remains are second language student. Our study should answer tow important questions:

• Do the student in the Individual high school curriculum have the fundamental knowledge in mathematic?

• How does the understanding of Swedish language effect in the understanding of the mathematic problems and in the students results in mathematic test?

In order to answer those questions, the students have to complete a mathematic test that consists of four parts. To answer the first questions the student must finish the first three parts of the test. It is about how to calculate addition, subtraction, multiplication and divisions problems and to account number in decimal and break shape. The mother tongue language student passed the test with excellence degree and they refused doing the fourth part. It was voluntary to participate and for this we couldn’t change there mind. Two students didn’t pass this test and they can not complete the fourth part. From the interviews we know that they have problem with concentration, they have ADHD (Attention deficit hyperactivity Disorder) and DAMP. For this they didn’t participate in the forth part. 

Just two students finished the fourth part and they passed it with good degree. To analyse the difference in the test results between the students, we make some interviews with teachers and students in the IV program. From the final results of the test and interviews, we realized that the second language students’ difficulties are depended on the defect in the vocabulary in Swedish language, defect in understanding of concepts and expressions and some others factors which can effect in students learning.