The Shanknaad Kalsarp Yoga forms when Rahu is in the 9th house of the birthchart and Ketu is in the 3rd house. You may face many upheavals in your life. There will be sudden success, and sudden failures. If you keep working hard, the success will be more than failures and you will climb shakily, but steadily.
Keep a check on your temper and try to avoid falsehood as it may create even more problems for you.
Remember, the Kalsarp yoga is not the only combination in your chart. If you have other positive combinations (yogas), there will have a positive impact and the negative effects of the Kalsarp yoga will be limited.