To determine your constitution it is best to fill out the chart twice. First, base your choices on what is most consistent over a long period of your life (your prakruti), then fill it out a second time responding to how you feel now, as they may have insight (and impartiality) to offer. After finishing the chart each time, add up the number of marks under vata, pitta and kapha.
This will help you discover your own ratio of doshas in your prakruti and vikruti. Most people will have one dosha predominant, a few will have two doshas approximately equal and even fewer will have all three doshas in equal proportion. For instance, if your vikruti shows more pitta than your prakruti, you will want to follow a pitta-soothing regimen to try and bring your vikruti back into balance with your prakruti. If your prakruti and vikruti seem about the same, then you would choose the regimen of your strongest dosha.