Hi Dear,

If you are planning to get admission in B. Planning programme the I'll recommend you to score as high as possible. The score you should have in JEE Main also depends on the college which you are targeting for admission. If you want to get into top B. Plan colleges then I'll recommend you to get a score above 220. You can check previous year cut off from link below:

https://engineering.careers360.com/articles/jee-main-cutoff-for-b-arch-b-planning#Previous-Year-JEE-Main-Paper-2-Cutoff

Good Luck