Focus on formulae and basic concept of each subject..
If u are dealing with electrical engg then u must focus on control system,signal and system,machines, power electronic, network theory
1. Electrical Machines
2. Power Systems
3. Power Electronics
These 3 subjects if covered perfectly will give you easily 35 marks
Next Subject is Aptitude and Engineering Mathematics will give u around 25-30 marks
All total u are getting 60
Prepare some easy scoring subjects like Digital Electronics which carries 5-6 marks
Ur average score will be above 60 just by preparing these subjects perfectly..
Good Luck