how do I study for nid 2019? what are the books and references for nid? what is the general knowledge I should possess for nift? what rank should I get for nift Bangalore?

The following is the syllabus for NID:

Design Outline for Beginners
Colour Terminology
Inspiration & Design Development
Mood Theme & Colour Inter-relationship
Design Theory
Elements & Principles Of Design
Natural & Geometrical FormInnovation in Design
Principles of Composition
Lettering
Optical Illusion
Understanding Light & Shade
Colour Psychology & Optical Illusions
Form & Function
Colour, Pattern & Texture
Theme Development
Creative thinking & writing
Picture Analysis
Visual Logic
Good Design vs Bad Design
Drawing Fundamentals
Use of Measurements, Scale & proportions
Optical Illusion
Foreshortening & Perspective
Developing Themes & Colour Associations
Inspiration & Creativity
Ornaments & motifs
Memory Drawing
Usage of Colour in Compositions
Expression & Emotion
Exercises on imagination
Lateral Thinking
Story Pictures
Presentation Techniques
Imagination & Doodling
3D Visualisation
Graphics & Pictograms
Innovation & Creation
Design Awareness

Following are a fee books I would suggest for NID:
Design drawing by Francis D.K.Ching
Basic Rendering from Robert W.Gill
NIDDAT book by R.S. Aggarwal (aptitude section)