hi priyanshu ,

• first of all know the entire syllabus 
• start of your preparation early. 
• know the exam pattern
• know the weightage of each topic to be sure about the preferance to be given.
• make your study plan before starting to study
• use proper study materials , books 
• make notes to remember
• emember the formulae

all the best

Hello, 

What the preparation of IES and GATE exam you can start a coaching for the particular exam or you can issue the book from library and start working on it so kindly make an see through it.