I am in 8th Standard. Just started for FTRE(FIITJEE TALENT REWARD EXAM) for class 9. Please advise what books/ study material can be referred to prepare for the same.

you can refer RD Sharma for mathematics (both for objective and subjective) S Chand for chemistry (the questions asked in chemistry is quite easy) and for physics you have to be very good in graphs and you should have a very good concept (as this is the toughest part asked in FTRE) refer HC Verma
you can visit the centre again and ask them for sample papers they will provide you the website and WEB ACCESS CODE and then you can view the sample papers.