is 315 a good score out of 450 for ftre
Considering the difficulty of Fiitjee FTRE Exam as well as from my personal experience I believe 315/450, roughly 70% is quite a strong score in FTRE and will ensure you get a good All India Ranking as well as certain scholarship benefits in FIITJEE Programs.
However, In future you will be probably preparing for Engineering Entrance Examinations like JEE Mains & Advanced and I would suggest you to make this a habit of targetting atleast 60-70% of the Total Score in Any Examination, and trust me you yourself will make your chances perfect for an Admit to one of the Top IITs in Top Branches.