JEE

My daughter got 81 percentile in 2019 exam. How is the percentage in view of getting an IIT?

You can't get any NITs at this percentile so you can go for private universities like Amity, Sharda, VIT, LPU, SRM, etc. You can also take the entrance exam of these private universities which is slightly easier than JEE.
All the best.

There are around 350 JEE Mains colleges for B.Arch across India, thus it is a tough competition to secure a seat in any one of these. There are a total of 9 NITs, 6 CFTIs and other institutes accepting JEE Mains paper 2 scores for admission to 946 total number of seats. Now, on the basis of your percentile your predicted rank is around 35000. You may be qualified for JEE Advance, but securing a seat can be a big challenge.

It is advised you to do it again, and score more than 98% marks for IITs.

Hello Shlok Singh,
In IIT Roorkee, the closing rank for general category students has been closing at about 2000 for electrical engineering and at about 4000 for mechanical engineering branches respectively. Of course, it all depends on perceptions of students and can swing either way this year or any year. Best wishes to you.

You are only eligible for NIT's, if you at least score 95 percentile in JEE paper 2.
According to JEE paper 2, you are only eligible for NITs and some prestigious college, but for IIT you have to qualify JEE paper 1, then JEE Advance. If you have to qualify in these two paper, then you have to apply for AAT examination.

If you don't want to appear for JEE, there are lot of other engineering entrance exams, check out the list below:
https://www.shiksha.com/articles/engineering-entrance-exams-in-india-blogId-5645
There are very few colleges that also take admission on the basis of class 12th marks.

For all Institutes, the basic eligibility in class 12th would be 60% in PCM.

Your score is pretty decent.
But, the final AIR will be declared after April 2019 considering the best score out of the two JEE Main attempts for all the applicants, hence based on current percentile we cannot predict whether you will qualify for RV college or not. Wait for the final AIR declaration.
Details:
https://www.shiksha.com/b-tech/articles/how-to-calculate-jee-main-rank-from-percentile-blogId-19953.