Kalpataru Behera is an accomplished author and educator renowned for his expertise in the field of Quantitative Aptitude. Born and raised in the beautiful district of Jajpur, Odisha, his passion for mathematics and aptitude led him to pursue an MSc in Mathematics from the prestigious Utkal University, Odisha. With a remarkable and felicitated teaching career spanning over 25 years. The Author has been a dedicated faculty member specializing in Aptitude training for various competitive exams. His insightful guidance and teaching methods have helped countless students achieve success in their pursuit of academic and professional goals. Recognized for his depth of knowledge and commitment to education, The Author decided to extend his impact beyond the classroom. As a result, he ventured into the world of writing and authored the critically acclaimed book "Quantitative Aptitude." Widely popular by the name of " Kalpataru sir" among his dearest students; his hard work, dedication, knowledge, and commitment to education have earned him admiration and respect from both students and peers alike. Currently residing in New Delhi, The Author continues to inspire and empower students all over India through his unique style of writing and teaching endeavors. His passion for mathematics and aptitude remains undiminished, and he remains an influential figure in the field of education, positively shaping the future of countless aspiring minds. This book serves as a comprehensive resource for individuals seeking to sharpen their quantitative reasoning skills, offering valuable insights and practical approaches to problem-solving.