Hello Batchu, Yes you can get Mechanical in BITS Pilani, Pilani campus on these marks because the last year cutoff for the mechanical course was 313. But I guess you would need to wait till the final round because you won't get the seat in first.
Below is the 2018 cutoff for main branches of BITS Pilani:
Degree programme at Pilani Campus
Cut-off BITSAT-2018 score
B.E. Chemical
280
B.E. Civil
274
B.E. Electrical & Electronics
338
B.E. Mechanical
313
B.E. Manufacturing
270
B.Pharm.
213
B.E. Computer Science
378
B.E. Electronics & Instrumentation
319
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