Hello Jayanth,

With a rank of 30998 in JEE mains you might get a seat in following NITs(with good branch in some and with bad in some):

• National Institute of Technology, Andhra Pradesh, Tadepalligudam, Andhra Pradesh
• National Institute of Technology, Jamshedpur, Jamshedpur, Jharkhand
• National Institute of Technology, Manipur, Imphal, Manipur
• National Institute of Technology, Mizoram, Aizawl, Mizoram
• National Institute of Technology, Rourkela, Rourkela, Odisha
• National Institute of Technology, Silchar, Silchar, Assam
• National Institute of Technology, Srinagar, Srinagar, Jammu & Kashmir
• National Institute of Technology, Uttarakhand, Garhwal, Uttarakhand
• National Institute of Technology Agartala, Agartala, Tripura
• National Institute of Technology Arunachal Pradesh, Yupia, Arunachal Pradesh
• National Institute of Technology Durgapur, Durgapur, West Bengal
• National Institute of Technology Hamirpur, Hamirpur, Himachal Pradesh
• National Institute of Technology Meghalaya, Shillong, Meghalaya
• National Institute of Technology Nagaland, Dimapur, Nagaland
• National Institute of Technology Patna, Patna, Bihar
• National Institute of Technology Raipur, Raipur, Chhattisgarh
• National Institute of Technology Sikkim, Ravangla, Sikkim

To find out your chances for IIITs and GFTIs you can visit the following JEE mains college predictor tool:

https://engineering.careers360.com/jee-main-college-predictor

All the best