The syllabus for the B.Sc. program entrance exam at BHU (Banaras Hindu University) likely focuses on the core concepts from Physics, Chemistry, and Mathematics covered in your 12th standard (Class XII) exams.

Physics:

• Mechanics (Laws of Motion, Work, Power, Energy, Momentum, Rotational Motion, Gravitation)
• Waves and Oscillations
• Heat and Thermodynamics
• Electrostatics and Current Electricity
• Magnetism
• Optics
• Modern Physics (Atomic Structure, Nucleus, Radioactivity)

Chemistry:

• Basic Concepts (Atomic Structure, Chemical Bonding, Periodic Classification)
• States of Matter (Solids, Liquids, Gases)
• Chemical Equilibrium and Acids-Bases
• Redox Reactions
• Chemical Kinetics and Catalysis
• Electrochemistry
• Inorganic Chemistry (p-Block and d-Block elements)
• Organic Chemistry (Functional groups, basic reactions)
  
  

Mathematics:

• Algebra (Sets, Relations, Functions, Matrices, Determinants, Quadratic Equations, Complex Numbers, Logarithms)
• Calculus (Differential Calculus - Limits, Continuity, Differentiation, Applications of Derivatives; Integral Calculus - Integration, Applications of Integrals)
• Coordinate Geometry (Straight Lines, Circles, Parabolas, Hyperbolas)
• Trigonometry (Ratios, Identities, Applications)
• Probability and Statistics (Basic Concepts, Measures of Central Tendency and Dispersion)
  
  https://university.careers360.com/download/ebooks/all-about-bhu-uet
  
  I hope it helps!