With the score of 340 your rank ranges in between 1 lakh - 2lakh .

here is the the range

https://medicine.careers360.com/articles/neet-result-marks-vs-rank

As you have not mentioned whether you want government or private seat its difficult to  say .  But lets make a general review of both government and private seats .

looking on previous year cutoff of government colleges in Karnataka , the cutoff for seat of  BDS was around  1 lakh . so there are fair chances for a seat in government medical college in Karnataka .

if you want to have a look of previous year cutoff , here is the link

https://medicine.careers360.com/articles/neet-cutoff-karnataka

moreover if you are interested in knowing which colleges are available according to your rank  all over india , you can use career 360 NEET college predictor tool .

this may help you to find suitable college for you .

here is the link

https://medicine.careers360.com/neet-college-predictor?icn=QnA&ici=qna_answer

Dear Student,

with the above mentioned neet 2020 score, there are a few colleges that you might be able to find a bds seat in Karnataka.

Kindly go through the link below to see the list of colleges, you will be eligible for:

https://medicine.careers360.com/articles/neet-cutoff-karnataka#Details-of-Karnataka-NEET-cutoff-2020