Processor: No. It cannot be changed.
RAM: Yes, but it has to be compatible with the laptop. Upgrading it to faster and higher quantity of RAM will improve gaming performance, but it will only add a few fps at best.
Graphics Card: Cannot be changed
Storage Drive: You might or might not have an upgrade slot to add an SSD. An SSD will make loading faster (only for the data stored on it) but will not improve actual gaming performance.
Overall, I wouldn't bother trying to upgrade it for demanding games.