I have passed 12th with 52% in science stream. I am confused about my career.

You can go for Btech after 2th science , you can try in some deemed university or private college lime LPU, Chitkara University, Chandigarh University , CGC

Since you have posted this query under science and engineering, for admission to a B Tech programme, your percentage is sufficient if you clear state level/national level entrance examinations with a good score.