Need GEPI preparation guidance

Hey guys. I got a call from SIDTM and need to prepare for GEPI. How should I prepare? Should I be enrolled in any course? How’s C2C mentors? Cuz that guy promotes symbiosis like crazy. His course fee is 3k. Should I invest that much money?

Bahoot paisa abtk phoonk diya hai exams mein, forms mein. Genuine tips please 🙏