You have not mentioned which exam you are talking about but since the JEE Mains January session results have been declared recently, I will be answering for it. If the question was intense for some other exam, please mention in the comments section.

Now NTA score is same as percentile. A score of 43.13 means that your percentile is 43.13 and you did better than 43.13% of the total candidates.

It is difficult to predict your marks with the given percentile as the marks vs percentile data changes every year depending on the level of the question paper and performance of the candidates. Although you can get an idea of your scored marks by checking your marked answer with the official answer key available on the JEE Mains website.

Although you can check your expected rank in JEE Mains using the formula:

(100-your total percentile) x 869010/100

So with 84.57 percentile, your rank would be around 494205.

Also, if the number of students increases to 12 lakh in the April session, the formula for rank calculation would change to:

(100-your total percentile) x 1200000/100

Hence your expected rank in this case would be around 682440.

According to your percentile, it will not be possible to clear the cutoffs for JEE Advanced. Also it will be difficult to get a seat in the top NITs or IIITs with this rank. I would suggest you to sit for the April session and give your best in that exam so that your chance of qualifying JEE Mains and getting a top college increases. Solve the previous years' papers, brush up your concepts and revise thoroughly.

You can also go through our college predictor to check which colleges you are eligible for through your JEE Mains score. The link for the college predictor is:

All the best.