If you scored 70% in your UP Board exams, you need to check the JEE Advanced eligibility criteria carefully. Usually, to qualify for JEE Advanced counseling, you need at least 75% marks in your 12th board exams or be in the top 20 percentile of your board. Since you have 70%, you may not meet the general cutoff. But if you are in a reserved category, the criteria might be lower. Check the official JEE Advanced rules for your category to be sure.