"target evaluation" is the first phase of hacking, so you should ask yourself "why would someone try to hack me?" . if you are an student , it could be love letter rather than a sinister hacker! BTW
if someone is targeting you, he/she has detailed plan. you can block the hacker (if it's not an illusion) using two methods :
safer/harder way: using vm ...
This is a very odd situation but I would take the following steps to understand what is on the card:
Create a clean VM (Windows since this is the most popular OS and if there is malware it is probably compatible with Windows) and disconnect it from the host in every way
Get a SD Card reader and mount it to the VM
Insert the SD Card and see what's on it