Hey you can calculate the cutoff using below formula:

• let the highest phy, che, math marks be x, y, z.
• let your marks in phy, che, math be a, b, c.
• cutoff out of 200 = (a/x)*50 + (b/y)*50 + (c/z)*100.

PSG requires a cutoff of 192 & above.

Anna university requires a cut off of 195 & above.

For more details refer

https://www.careers360.com/colleges/college-of-engineering-guindy

https://www.careers360.com/colleges/psg-college-of-technology-coimbatore