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KVPY Stream SB consists of two parts, first one has 80 questions, in part I any three sections are to be attempted and second part has 40 questions where any two sections are to be attempted, total marks is 160, the exam will be conducted for three hours, in order to commence your preparation first of all be acquainted with the syllabus, you can refer the important topics of

Physics are Mechanics, Ray Optics, Electromagnetism, Waves

Chemistry are Physical Chemistry, Atomic Structure, Chemical Bonding, Chemical Energetics, Organic Chemistry, Stoichiometry and Gaseous State

Biology are Biomolecules, Molecular Genetics, Cell Biology, Biotechnology

Make a timetable, accordingly assign number of hours for each subject, choose the appropriate study materials, NCERT is the best choice regarding this, apart from it you can also go for other reference books such as

Physics

Fundamentals of Physics by David Halliday

Robert Resnick, Jearl Walker; Concept of Physics by DC Pandey

Tata Mc. Graw Hill’s Book by HC Verma

Chemistry

Moderns ABC of Chemistry for Class – XI With CD by Modern Publishers

NCERT Physical & Organic Chemistry by OP Tandon

Biology

Biological Sciences by Taylor Green and Stout by Cambridge Publications

Elementary Biology (Volume – 1) by K.N. Bhatia

M.P. Tyagi; Publisher: Trueman

Conceptual understanding of topics are highly imperative, as only after this you will be able to solve questions and practice them with ease, hence emphasize on building clarity in the concepts of the topics. Be thorough with the syllabus of 10,11th, 12th,  make short notes if requires, revision is  the key to excel in exam, go through previous year papers a thttps://school.careers360.com/articles/kvpy-sample-papers , apply mock tests on regular basis in order to evaluate your preparation level & improve upon the areas that require the attention.