This book is written for B. Honours students. It covers calculus and part of algebra. In calculus portion function, limit and continuity, differentiability and application of derivatives and indefinite integral (introductory) are discussed. In algebra portion matrix and determinants are included. Prime aim of writing this book is to give the basic ideal of these concepts. Thereafter a large no. of solved problems are included so that without help of others students can solve the problems independently. Also applications of these concepts in the field of commerce are given so that students may be motivated to this subject.