Hello Shabnam Kumari!

There are many..

1. Get a rank under 100 and you’ll get a PSU call for the post of Chemist from ONGC or IOCL( but it requires two years of related experience). And even from government sectors like DRDO and BARC for the post of Scientific Officer.
2. Using the GATE rank, you can also apply in IIT’s , NIT’s and IISER’s for PhD.
3. Even some foreign universities, like National University of Singapore, NTU and a few universities in Germany take students for PhD based upon the Gate score( more than 90 percentile is needed, which is actually very less)
4. You can also go for M.Tech. in Chemistry in various IIT’s. So don’t think much, just prepare well.. All the best!!