What should i do about him?

my junior year is almost over for me and all the seniors have about 6 more days when I have 16 (they get out earlier). In my art class there is this senior who i really like. we always flirt and talk, we even went on a walk to the bathroom together, but I quickly running out of time. I have like 3 of the 5 days with this kid and after that i probably will not see him. I do not have texting on my phone so i cant give him my number, or could i and just tell him to call me. i just dont know. If he really like me do you think he will engage the situation or am i letting him slip through my gripe.How should I engage the situation and