Hello,

To tell you about your exact admission possibilities is tough since Cutoff vary every year based on numerous factors.
SVNIT Surat cutoff for chemical engineering branch in ST category for the years 2019, 2018, 2017 & 2016 are as follows

2019 :- 2143
2018 :- 6190
2017 :- 2478
2016 :- 2181

So as you can see the cut-off numbers are different every year, so there's no way anyone can actually tell you about your exact chances until the cut-off is out but the range of cutoff might be near 2500 but it can change also.
To know your admission chances in JOSSA & State counseling you can use JEE Main college Predictor tool.

https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer

SVNIT Surat

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