• Solve last year question papers once and analyse them thoroughly.
• Solving these papers would give you the best insight into the type of questions asked by UPSC in CSAT paper.
• If you score more than 50 % in all of the previous year question papers then there is nothing to worry and just practise one or two mocks before the prelims exam.
• During the exam just attempt that section first which is your strength like it could be logical reasoning or Comprehension or any other topic.
• You could work on your weak areas by practising that section from any of the books available for CSAT like Arihant etc.
• The best strategy would be to solve 25–30 CSAT questions ( from various institutes test series or any question bank) daily till the time one is confident in attempting CSAT.
• Daily practise is much more effective rather practising whole mock at one go.
• Always keep in mind that one needs to only score 33% of 200 as this paper is of only Qualifying nature. Thus invest that much time only in preparing CSAT which would ensure your qualification.

Hope This helps.

Feel free to ask any further doubts

All the best !