so let us first loo at the syllabus for the exam 

Atomic Structure, Chemical Bonding, Acid-Base Concepts, Colloids, Colligative Properties of Solution, Isomerism, IUPAC, Polymers, Redox Reactions, Electrochemistry, Catalysis, Chemical Equilibrium and Kinetics, Periodic Table, Thermochemistry, General Organic Chemistry, Carbohydrates, Solid State, Petroleum.

now coming to preparation:

• UPSEE is not as tough as that of the Mains level
  

• for chemistry you can rely on the NCERT as it has enough knowledge needed for the exam.
• You can also make the reaction mechanism chart and then constantly revise them.
• Solve the previous year question papers as well as the questions tend to repeat.
  
• read biomolecules chapter thoroughly as chances of direct question from tat topic is quite high.
  
• 
  

hope it helps.

Thankyou