Hello Student, 

LPU generally takes admissions through their own exam LPU NEST which is not that hard and is without negative marking. One need to apply via that only.
And sorry but 500k rank is much higher for getting into LPU.
In my opinion best thing is to give LPU NEST or apply for some other good institutes.
For that your can check here:
https://engineering.careers360.com/jee-main-college-predictor
Hope this will help.
Feel free to ask any doubts.