Hello Aspirant,

No, you cannot take admission on either your class 12th basis or on the basis of GUJCET performance. If you are seeking in SVNIT or in any other NIT or IIIT then you have to appear in JEE-Main and should qualify it with the good marks so that you can clear the cut-off for SVNIT, then only you are eligible for admission in SVNIT for B.Tech program. you can go through the previous year's cut-off for SVNIT to have an idea from the link given below :-

https://engineering.careers360.com/articles/jee-main-cutoff-for-svnit-surat

I hope this information helps you.

Good Luck!!