Take Surat Bandra InterCity Express/12936 to Mumbai & From Mumbai CST-Mangalore Junction Express/12133
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Surat Bandra InterCity Express/12936 -- 2013-08-10, Sat 2S -- Avbl 250
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CSTM-MAJN Express/12133 -- 2013-08-10, Sat SL -- GNWL# 1...
more... / RAC73
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You have pretty good buffer of 1 Hr 45 Mins for Transfer from BDTS to CSTM.
Sleeper in 12133 should confirm.