How about this approach?
Column "A" (contains your "P") and column "B" (contains your "1") contains your data, both on row one in this example. In coulmn "C" you type "=AND(A1=P;B1=1)". This returns TRUE if the AND-condition is true. Expand this down column "C" to cover the number of rows you have your input on (e.g. "C2" will have the formula "=AND(A2=P;B2=1)")
In another cell, where you want the amount of special students displayed, you type "=COUNTIF(C:C;TRUE)".
COUNTIF will now count all cells in column "C" that contains TRUE.
If you want to expand this the formula in column "C" could by "=IF(AND(A1=P;B1=1);"Special student";"Ordinary student"). This would return the text "Special student" in cell C1 if the statment is TRUE. Then you change the COUNTIF to "=COUNTIF(C:C;"Special student")". Noe th eCOUNTIF will count the numbers of cells that have the text "Special student" in column "C".
Hope this makes some sense to you. It's bl***y hard to explain in plain text.
TIP:Use the menu Insert - Function... (symbol is a "fx") and search for the function. The help text displayed once you selected a function in the wizard is great and tells you how the function works in detail. The best functions I use is COUNTIF (suprise) and VLOOKUP. Both are great to manage tables of data.
Good luck. //Dan-Erik
