Hello amandeep,
In jee mains you can get marks for this answer in which you have wrote 100 instead of 100.00 .after NTA normalisation procedure this year everyone will get marks whose answer is approx 100 for example if someone wrote 100.01,100.1,99.99 etc. Then he she/will also get marks.so don't worry about this.
You can predict your rank by using rank predictor in which you have to fill marks, category etc. Link for this is
You will also use career360 college predictor tool which is designed by analysing previous year trends by career360 experts which gives list of colleges in which you have chance of admission.link for college predictor is https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer
Hope this helps you.
Good luck.

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