how to know nd solve 12maths in exams as every question is different

Hi

You need to know and practice the whole syllabus of class 12th Mathematics. Every question is different because it is from different topics and chapters.

To pass and get a good score, you will have to practice the whole syllabus from NCERT books.

You can also refer to other books for more practice.

To score good in the exam you need to go through well  with NCERT books properly & need to do practise as much you can.There are few questions that require the candidates to prove the given statements or equations. These are mostly from the NCERT text books.
Here are some tips you can follow.
Calculus has more weightage, so spend a lot of time on it. But also the topics such as Probability, Algebra and Linear Programming should not be ignored as the problems from these topics are quite easy and straight forward.
Pay special attention to the previous years exams papers and solve them under the stipulated time.
When solving calculus and algebra questions, always mention which property you have used.
Definite integration and inverse of a matrix require practice.
Vectors and 3D require clear with the concepts.For probability, the way you present your answer is very important.
Never spend too much time on one question, then only you will be able to finish complete examination in time.

Good Luck!