Hello. The individual section scores & NTA score are the percentile scores and not the raw marks i.e. it indicates the total percentage of students who have scored equal to or below your marks. So suppose you score 300 in a session and it is the highest in your session you will have a percentile/NTA score of 100. Similarly, like your NTA score in Physics is 22.645 which means that 77.375% of total students who appeared in the exam are ahead of you in the subject Physics. And your total NTA percentile/score is 5.44 which means that 94.56% of tot. students who appeared in the exam have got more raw marks than you in total.

Since these scores are only percentile scores for individual subjects therefore their addition may not be your total NTA score (does not depend on it and it varies).

You can check the below link to know more about this normalisation/percentile system.

https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-normalisation-process-how-scores-are-calculated/amp

Hope this helps. Good luck!