Wukong always solo top, you should purchase cloth armor to increase your armor. When you die or back home, purchase the phage can increase your attack damage and health. Sheen can help your crushing blow after nimbus strike can have more damage. Next trinity force, this is the most important item for Wukong. It provide all the things that Wukong need. After that, giant's belt.
After the trinity force, you will find that your health is not enough to fight with others. Next, atma's impaler. Because you have purchased the giant's belt, you should purchase this to increase your damage. Warmog's Armor, can increase your health , your damage also. Because yiu purchase the atma's impaler. If you find that the enermy ap carry is very over power, you should start to purchase force of nature, to increase magic resistant. The last item, maw of malmortius, can increase magic resistant and damage. If the enermy ap carry isn't very stong. You can change the last two item to warmog's armor. After that, no one can kil you