The simplest way I can think of would be to store the info for each student in a csv (comma separated values) file:
Studen_ID, Year, First_Name, Last_name, Height, Reach, Vertical...etc
456874909, 2007, John, Doe, 6, 72, 28...etc
...etc
Accessing data in a csv file will be much easier for you if you are a beginner. Of course updating it might be kinda tedious unless you can export the data from Excel easily. If not, you can always read the Excel file with PHP, but its more complicated in my opinion.
Another idea would be to store the data in a mysql database and just stop using excel altogether. You could write an app using PHP/MySQL to let you input a students info, calculate their ranking and store it in the database. That's the way I would do it, but the learning curve will be a little steeper. Good luck!