Question

how to take 1 rank in science fair, what project should i make got 1 rank for 9th standard

Answer 1

you should do triple point experiment where a substance changes it states without application of heat

Answer 2

solar system
iron purification
related to environment
heart, brain, eye or ear any 1 make a model with correct and detailed labeling...
and u also know about function and specification.... i hope its help 4 u