what is the minimum qualifying score in BITSAT 2018

Hi.
If you are talking about the minimum eligibility criteria then it is to pass the 12th examination from a recognized Central or State board or its equivalent with Physics, Chemistry and Mathematics (PCM) and adequate proficiency in English.
And if you are asking about minimum marks to get admission in BITS then here is a cut off list for all campuses of BITS and their various branches.

PILANI
1. Chemical Engineering- 306
2. Civil Engineering- 294
3. Electrical & Electronics Engineering- 355
4. Mechanical Engineering- 334
5. Manufacturing Engineering- 288
6.Computer Science and Engineering- 382
7. Electronics & Instrumentation Engineering- 332

GOA
Chemical Engineering- 276
Electrical & Electronics Engineering- 320
Mechanical Engineering- 304
Computer Science and Engineering- 350
Electronics & Instrumentation Engineering- 301

HYDERABAD
1. Chemical Engineering- 272
2. Civil Engineering- 273
3. Electrical & Electronics Engineering- 310
4. Mechanical Engineering- 297
5. Computer Science Engineering- 339
6. Electronics and Communication Engineering- 320
7. Electronics & Instrumentation Engineering- 298
8. Manufacturing Engineering- 269