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Aman, I am sorry to say with your 70% in 12th board examination you will not be able to appear in JEE Mains 2019 as for admissions to NITs/ IIITs/ GFTIs, candidates should have secured at least 75% marks in class 12th exam or be in the top 20 percentile in the class 12th exam conducted by the respective board. For SC/ ST candidates, the eligibility criteria is 65% marks in class XII. And without clearing JEE Mains examination you cannot appear in JEE Advanced examination.

Now the only option left for you to be eligible to appear in JEE Mains exam is that whether your 70% in the UP board brings you in top 20 percentile among all the students who appeared in the 12th class in your UP board in this 2017-18 session.

Along with this to check other eligibility criteria for you to be eligible to appear in JEE Mains 2019 examination you can go through the link mentioned below:

https://engineering.careers360.com/articles/jee-main-eligibility-criteria

Feel free to ask if you have any more queries. All the best!!