Hi, since you have got 308 rank in UPSEE exam and got 8139 rank so based on this I'm mentioning the colleges below in which you can get into with this rank and marks;

• Rajkiya Engineering College, Banda
• KIET, Ghaziabad
• Ajay Kumar Garg Engineering College, Ghaziabad
• JSS Academy of Technical Education, Noida
• PSIT, Kanpur
• Rajkiya Engineering College, Bijnor
• IERT, Allahabad
• BIET, Jhansi
• CSJM, Kanpur
• University Institute of Engineering and technology, Kanpur

Etc.

You can also visit on the below link to predict your college by your own on behalf of the the rank you have got(link mentioned below):-

https://www.careers360.com/upsee-college-predictor

Good Luck.