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Maths
Rational Numbers

Irrational numbers Algebraic Expressions ,Equations and Identities
Multiplication tips
Squares and Square Roots
Cubes and Cube Roots 
Angles,Polygon And Geometric Formulas

Gate syllabus
 IIsc PHD syllabus

Chemistry

   Difference between Atoms ,Elements, Molecules, Compounds and Mixtures

   Ionic bond

   Covalent Bond

   S-Block Element with oxide and Hydroxide

Biology

   Asexual Reproduction in plants and animals
   sexual Reproduction in plants
   Sexual Reproduction in Animal 
    Types of cells ,Prokaryotes ,Archaea and Eukaryotic Cells 
   Difference Between Prokaryotes and Eukaryotes
   Difference between Plants and Animals 
   Cell Division
   Cell Cycles
  Chromosomes and chromatin structure
  Mitosis 
  Meiosis 

Eukaryotic Gene and Gene Expression

Cell organelles