i get 98.048percentile in jee main January 2020. i am from obc. i am girl. which engineering course should be best for female carrier? can i get iit, nit directly? i live in Kolkata. which is the best college for that course? can I get admission that course there?

Congratulations for getting such good marks. As you got 98.048 percentile in January Session, your expected rank will be 16,963. At this rank, you can get into NITs such as NIT Surathkal, Duragpur (also comes under your home state quota), Kurukshetra, Andhra Pradesh, Rourkela.
In case of admission to IITs, you need to appear for Jee Advanced. NTA hasn't released the cutoff, but you got 98.048 percentile which is really a remarkable score, so there's decent chances to qualify for Jee Advanced.
You can check Different NIT Cutoffs of last year-
http://engineering.careers360.com/articles/nits-cutoff-for-top-btech-branches
There is nothing like good or bad for girls in engineering. But you can go for one of the most desired branches i.e. Cse or EnTc or Electronics & instrumentation.