The exact number of marks required to secure admission into a top government college after the CET exam can vary significantly based on several factors:

• Year of Exam: Cut-off marks fluctuate from year to year depending on the difficulty of the exam, the number of applicants, and the number of available seats.
• State and College: Different states have their own education boards and counseling processes. The cut-off marks for a top engineering college in Maharashtra, for example, might be different from those in Tamil Nadu.
• Branch of Engineering: The popularity of a particular branch (e.g., Computer Science, Electrical Engineering) can also influence the cut-off marks.
• Category: Reserved category candidates often have lower cut-offs compared to general category candidates.

General Trends:

• Highly Competitive: Top government engineering colleges are highly sought after, so competition is intense.
• Rising Cut-offs: Due to increasing demand, cut-offs tend to rise year after year.
• State-Level Counseling: Most states have their own centralized counseling processes for engineering admissions, where you need to fill in your preferences for colleges and branches.

To get a more accurate estimate of the required marks, I recommend the following:

1. Check Previous Year Cut-offs: Look for previous year's cut-offs for the specific colleges and branches you are interested in. This will give you a general idea of the range.
2. Analyze Trends: Try to understand the trends in cut-offs over the past few years. Are they increasing or decreasing?
3. Seek Guidance from Experts: Consult with career counselors or teachers who have experience with the admission process.
4. Stay Updated: Keep yourself updated about the latest news and announcements regarding the CET exam and counseling process.

Remember: While a high score increases your chances of getting into a top college, it's not the only factor. Some colleges also consider factors like your board exam percentage and performance in the personal interview (if applicable).