If you understand the syllabus completely, you can plan a reasonable plan for your preparation that will require fewer hours, and explore more topics.
It is advised that a student must commence from essential questions for their weaker topics.
Vedic Maths is a remarkable compilation of sutras for solving maths problems quickly and efficiently.
Tables, squares, cubes, and so on are typically used to speed up calculations. Memorising and practising will help you remember them.
Students acquire problem-solving abilities and grow more comfortable exploring for new answers when they understand how to get what they want.