Is only WBJEE rank important to get into Jadavpur University & not the 12th percentage because I've got a low percentage in 12th i.e. 58%.

For admissions to universities abroad to undergraduate courses, a PTE score between 51-60 is generally considered sufficient. However, higher scores can lead you to win an atractive scholarship or get selected in a good college.  

Yes, Indian students can definitely study on scholarship in South Korea after 12th. There are various scholarships available for students from India including-

• Global Korea Scholarship or GKS Scholarship
• University-Specific Scholarships
• Private Scholarships

To increase your chances of securing a scholar

International students who have completed their 12 from a board that the university considers with an advanced test like IIT JEE or STEP are allowed in the university. Students should also appear for ACT/ SAT test and submit English language requirements to get UG admission.

Any stream can choose this course, There is no specific stream required to be eligible for this course

Bro, the best course is to take BSC in artificial intelligencxe and BSC in data Science because it has very huge job oppurtunity in market, AAFT Noida provides degree in these domain and provides placement. here are good teachers who are experienced in good company