Crash courses and revision batches are intensive, short-term programs designed to help students quickly review a syllabus before an exam. They typically focus on high-weightage topics, include practice tests and mock exams, provide study materials like notes and formula sheets, and offer strategies for exam-taking. These programs are available for various exams, including board exams (CBSE), entrance exams (JEE, NEET), and other competitive exams.