P3 n p5 papers

Dear teacher. Kindly advise me on the optional paper to select pls.
Im taking p3 now for jun. Is it related some knowledge to support p5 (if i taking in sep).
Seeking yr advise alot. As i would like to use some of concepts which i hv learnt fr p3 now for p5 paper.

Or else, the p4 will not relevant at all to p3? Is it p4 as a higher level of f9 pls.

Hope u can share w me some advice pls. Tks tr