There are total 13 chapters in Class 7 Maths as per the rationalized Syllabus. All the chapters are required for assessment
Couple of book
(a)NCERT Class 7 Maths textbook
(b)NCERT Class 7 Exemplar
(c)RD Sharma or RS agarwal
Integers and Symmetry are the easiest chapter
It is sufficient if you go through all the questions in the NCERT text book thoroughly and practice them all.However to enhance your maths skill , you can go for NCERT exemplar and other books
First go through all the Notes and solved examples and Then do the exercises. Practice Lot of questions. The simple Mantra is Practice .Practice and Practice
Chapter 1: Integers
Making multiplication easier,Product of three or more negative numbers
Chapter 2: Fractions and Decimals
How well have you learned about fractions,How well have you learned about decimals
Chapter 3: Data Handling
Collecting data, Organisation of data, Chance and probability
Chapter 4: Simple Equations
From solution to equation
Chapter 5: Lines and Angles
Adjacent angles,Linear pairs,Vertically opposite angles
Chapter 7: Comparing quantities
Equivalent ratios
Chapter 9: Perimeter and Area
Introduction,Squares and rectangles,Triangles as parts of rectangles,Generalising for other congruent parts of rectangles,Conversion of units,Applications
Chapter 10: Algebriac Expressions
Addition and subtraction of algebraic expressions,Using algebraic expressions–formulas and rules
Chapter Practical Geometry
Whole Chapter Deleted
Chapter Congruence of Triangles
Whole Chapter Deleted