try to solve the papers from last 6attempts. especially he first two practical questions which are asked on business .these have a weighrage of around 30marks. then there are McQ with additional 30marks. then try to solve problems on TDS and IFOS which again have weightage of around 20marks. so in this way you can cover 80marks. take the PM of institute or suggested answers.
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Thanks ...can u also suggest me a book for dt or any other suggestions for other subject. I will be highly grateful for ur support.