Quantitative Aptitude | CRACKER by Kailash Thakur is a thorough resource for the CA Foundation (Paper 3), specifically tailored for the Sept. 2025/Jan. 2026 exams. It features extensive past exam coverage (including May 2025), model questions, RTPs/MTPs, and a chapter-wise marks breakdown for the targeted study. Newly introduced topics like calculus and sampling theory are well-covered and supplemented with calculator shortcuts and time-saving tips. The book's progressive difficulty, ICAI-aligned structure, and student-friendly approach ensure a seamless learning experience.