It is not mandatory but 99.9% of candidates join MPPSC coaching classes to score better in the exams as there they can get preparation material, guidance & tips to make their dream come true. So your first challenge as an MPPSC-AE candidate would be to enroll yourself in the best coaching for MPPSC-AE.

https://www.aecinstitute.com/blog/what-is-the-latest-mppsc-ae-syllabus/