Honestly speaking, it is never possible to clear Maths 2 with just a one-night study session. Therefore it is suggested that you avoid such last-minute attempts and just rely on the book N.P. Bali.
This book contains some previous year’s questions. Try mugging up all examples and concepts thoroughly from this book and practice more on previous year’s questions. Also focus on the last chapter wave equations, heat equations as these are frequently asked. You need to dedicate just 2 hours daily upto 1–2 months to get prepared.
It is assured that you will be getting more than 70 marks on every next attempt. Try to cover all the pages provided to write, it matters most in AKTU/UPTU.