Hello dear..

. Your most important source is the previous year question papers because many questions are repeated as it is. I just purchased a single book(Kiran Prakashan) containing previous year papers and solved it 3-4 times. After completing that book, I didn't feel the need to consult anything else and it actually worked for me.

2. General Awareness - This section has the least benefit-cost ratio. You will invest more time, but your return will be low. I will recommend you not to waste much time here(at max 1 hour daily). Moreover I have found that Lucent's GK book has the best compilation, especially for CGL. So instead of referring multiple sources and wasting your limited time, just go for Lucent.

3. Reasoning - Most scoring section of Tier-1, because the questions are pre-defined. Just practise the question papers, and you will definitely score well (you should at least get 40+ here, in less than 30 minutes).

4. Quantitative Aptitude - Most important part of the syllabus. This is the section where you should devote most of your time. Just purchase any good book (Arihant is fine) and practise thoroughly. Mugging shortcuts will help you to get an edge over others. Try solving every question within 1 minute.

5. English - Most tricky portion. Every section of this portion is unpredictable. You can't guess which idioms, antonyms, synonyms, phrasal verb, etc. will be asked.
Error correction - at least prepare the rules used in previous year papers
Idioms, One word substitution, Synonyms, etc. - Learn 10 words each, daily.
Direct- Indirect and active-passive- Very scoring. Just mug the rules
Comprehension - You can't do much here. Reading news paper can help.

I think I have touched every portion and I will re-iterate, don't ignore the previous year question papers..

Best of luck..