Hello,

If preparatory rank in JEE Advanced is 150 then based on the previous year cut off in round 6 of JoSAA counselling here is the list of IITs in which you may get seat under ST category

• Indian Institute of Technology Bhubaneswar : Metallurgical and Materials Engineering - 250
• Indian Institute of Technology Bombay : Chemistry- 203
• Indian Institute of Technology Bombay : Environmental Science and Engineering - 304
• Indian Institute of Technology Mandi : Engineering Physics- 645
• Indian Institute of Technology Delhi : Textile Technology- 314

Cut off changes every year depending on total number of candidates appeared, difficulty level of examination and total number of seats available etc.

To check the previous year cut off click on the link given below

https://engineering.careers360.com/articles/jee-advanced-cutoff